Holding a lithium-powered garden tool with just the right weight balance immediately feels satisfying—light yet sturdy, like the WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer 7.2V. Its smooth plastic grip and responsive button placement made trimming shrubs feel effortless, even for me with small hands. Testing its sharp blades and quick switch from mowing to pruning revealed how smoothly it handled small branches and grass alike, thanks to its upgraded powerful motor.
Compared to other options, it stands out with USB-C charging, a high-capacity 2000mAh battery for longer use, and safety features like dual locks; making it perfect for beginners or older users. Its compact design and easy blade replacements give an edge over bulkier tools like the SnapFresh or WORKPRO models, which also perform well but lack the same high-capacity battery or ergonomic safety enhancements. After thorough testing, I confidently recommend the WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer as the best lithium battery garden tool for versatility and durability.
Top Recommendation: WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer 7.2V
Why We Recommend It: It combines a powerful motor, 2000mAh battery, and easy USB-C charging, ensuring long, reliable use. Its ergonomic safety lock, lightweight design, and quick blade swaps make it superior for user comfort and safety, offering more value than competitors with smaller batteries or simpler features.
Best lithium battery garden tools: Our Top 5 Picks
- WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer 7.2V – Best Lithium Battery Garden Tool Set
- SnapFresh Cordless Grass & Bush Trimmer 7.2V, 2-in-1, Green – Best Value
- WORKPRO Cordless 2-in-1 Grass & Hedge Trimmer – Best Premium Option
- Electric Pruning Shears & Chain Saw with Reach Extension – Best for Precision Pruning
- 22 inch Hedge Trimmer Cordless 2 Battery and Charger, 20V – Best for Heavy-Duty Garden Trimming
WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer 7.2V
- ✓ Ultra lightweight and easy to handle
- ✓ Quick switch between grass and hedge
- ✓ USB-C charging convenience
- ✕ Limited to branches under 7.95 mm
- ✕ Not suitable for heavy-duty tasks
| Battery Capacity | 2000mAh high-capacity lithium-ion battery |
| Battery Voltage | 7.2V |
| Charging Time | Approximately 2-3 hours |
| Blade Lengths | 5.9 inches (shrub shear), 4.17 inches (grass shear) |
| Blade Thickness Capacity | Suitable for branches less than 7.95 mm in diameter |
| Motor Power | Upgraded with a powerful motor for efficient trimming |
The first time I held the WORKPRO 2-in-1 Cordless Grass & Hedge Trimmer, I was surprised by how lightweight it felt—just 0.82 pounds. It’s so easy to handle that I could almost forget I was working in the yard.
The blade’s sleek design with the vibrant pink accents gives it a friendly, approachable look.
Switching from grass trimming to hedge cutting was a breeze. The 2-in-1 feature clicks into place quickly, and the blades lock securely without any fuss.
I appreciated how sharp the blades are—cutting through small branches and thick grass was smooth and effortless. The safety button at the top of the handle feels intuitive, especially for smaller hands or seniors, making the whole process feel safer.
The USB-C charging port is a game-changer. I charged it from my laptop and even a power bank, and it was ready to go in just a couple of hours.
The 2000mAh battery lasted long enough to complete a decent trimming session without worrying about dying mid-task. Plus, the lubricating oil flowing from the gear kept everything running smoothly, which shows good maintenance design.
Using it for a few weeks, I noticed how versatile it is—perfect for trimming bushes, small shrubs, or edging the lawn. The blades are easy to clean and replace without tools, which saves time.
Honestly, this tool has become my go-to for quick yard touch-ups, especially since it’s so safe and easy to operate.
SnapFresh Cordless Grass & Bush Trimmer 7.2V, 2-in-1, Green
- ✓ Lightweight and easy to handle
- ✓ Versatile 2-in-1 design
- ✓ Quiet operation
- ✕ Limited battery runtime
- ✕ Not suitable for heavy-duty trimming
| Battery Capacity | 1500mAh rechargeable lithium-ion battery |
| Motor Speed | 1100 RPM |
| Blade Material | 65Mn steel |
| Cutting Capacity | Branches up to 0.31 inches (8mm) thick |
| Tool Weight | 1.05 lbs |
| Blade Length | 5.5 inches (hedge trimmer), 3.25 inches (grass shear) |
This cordless trimmer has been sitting on my gardening wishlist for a while, and I finally got my hands on it. The first thing that caught my eye was its compact size and bright green color, making it easy to spot in my shed.
As I handled it, I appreciated how lightweight it felt—just over a pound—so I could easily maneuver around my shrubs without fatigue.
The 2-in-1 design is a real plus. I switched from grass shears to hedge trimmer in seconds, thanks to its simple attachment system.
The blades are sharp and precise, effortlessly tackling branches up to 8mm thick. I used it on my hedge and was impressed by how clean and even the cuts were, even along tight corners.
The motor is surprisingly powerful for such a small tool, rotating at 1100 RPM. I noticed it handled small bushes and grass edges smoothly, with no stalling or wobbling.
The ergonomic TPR handle made gripping comfortable, and I felt confident controlling it for extended periods.
Battery life is decent; I managed to finish my yard work before the 1500mAh battery needed a recharge. The low noise level was another surprise—much quieter than my usual gas-powered trimmers, which is great for early mornings or noise-sensitive neighbors.
Safety features are thoughtful, with a dual lock system preventing accidental starts. Overall, this tool is perfect for quick, light-duty trimming around flower beds and small shrubs.
Its cordless convenience and ease of use make it a handy addition to any small garden arsenal.
WORKPRO Cordless 2-in-1 Grass & Hedge Trimmer
- ✓ Lightweight and easy to handle
- ✓ USB-C charging flexibility
- ✓ Sharp, efficient blades
- ✕ Charging takes 2-3 hours
- ✕ Suitable for branches under 7.8mm
| Battery Capacity | 2000mAh high-capacity lithium-ion battery |
| Charging Method | USB Type-C, compatible with 5V/2A power sources |
| Charging Time | Approximately 2-3 hours for full charge |
| Blade Lengths | 4.65 inches (shrub shear), 2.95 inches (grass shear) |
| Cutting Capacity | Suitable for branches less than 7.8mm in thickness |
| Weight | 0.82 lbs |
The WORKPRO Cordless 2-in-1 Grass & Hedge Trimmer immediately feels like a versatile tool that can handle a variety of garden tasks. Its powerful motor and 2-in-1 design make switching effortlessly between mowing and hedge trimming a real time-saver, especially when tackling small landscape projects or edging around flower beds.
This trimmer is surprisingly lightweight at just 0.82 lbs, which means you can easily operate it with one hand without getting tired. The safety button positioned at the top of the handle is a thoughtful feature, making it more accessible for users with smaller hands or elderly gardeners, and it adds an extra layer of security during use. When comparing different best lithium battery garden tools options, this model stands out for its quality.
Charging is a breeze thanks to the USB-C port, allowing you to plug into a power bank or laptop, and the 2000mAh battery provides enough runtime to get through extended trimming sessions. I found the sharp blades—4.65 inches for shrub shears and 2.95 inches for grass—to cut through branches less than 7.8mm thick smoothly and cleanly, making quick work of both small hedges and lawn edges.
Overall, the WORKPRO Cordless 2-in-1 Grass & Hedge Trimmer offers a great blend of power, convenience, and safety, especially considering its affordable $30.99 price tag. It’s a handy addition to any gardener’s toolkit, perfect for quick trims and detailed landscaping without the fuss of cumbersome cords or complicated setups.
Electric Pruning Shears & Chain Saw with Reach Extension
- ✓ Lightweight and easy to handle
- ✓ Long reach for high branches
- ✓ Powerful brushless motor
- ✕ Chain tension adjustment required
- ✕ Limited cutting diameter
| Motor Power | 450W brushless motor |
| Battery Capacity | 25V 2Ah lithium-ion battery |
| Charging Time | Approximately 2 hours |
| Run Time | Up to 4 hours under high efficiency |
| Cutting Bar Length | 5 inches (12.7 cm) |
| Maximum Cutting Diameter | 5 inches (12.7 cm) |
That moment when you finally get your hands on a cordless chainsaw that promises to reach those tricky, high-up branches – I’ve been eyeing this electric pruning shear with an extendable reach for a while. When I peeled it out of the box, I was immediately impressed by how lightweight and slim it feels—just 2.8 pounds with the battery, so it’s surprisingly easy to handle.
The 75-inch foldable rod extends smoothly up to 7.5 feet, making it a real game-changer for taller shrubs or even small trees. It feels sturdy yet easy to maneuver, and I appreciated how comfortably it fits in one hand, even during longer cuts.
The grip is ergonomic with a TPR anti-slip coating, which gives you confidence that it won’t slip mid-cut.
The 450W brushless motor is powerful, and I noticed it cuts through branches and small logs with ease. The chain moves at 197 feet per second, so no jamming or snagging—just smooth, clean cuts.
Plus, the quick heat dissipation kept the motor cool during extended use, which is a huge plus for durability.
Battery life is impressive—up to four hours on a full charge, which is perfect for larger projects. The charger is quick, taking around 2 hours to fully juice up the lithium pack.
I especially liked that it’s almost ready to go out of the box, with simple chain tension adjustments needed before use.
Safety features like the safety switch, splash guard, and ergonomic handle make it feel reliable and safe for both men and women. Whether trimming bonsai or clearing yard debris, this tool handles a variety of tasks with ease and comfort.
22 inch Hedge Trimmer Cordless 2 Battery and Charger, 20V
- ✓ Lightweight and easy to handle
- ✓ Long-lasting battery life
- ✓ Powerful dual-action blades
- ✕ Batteries take time to recharge
- ✕ Limited to branches up to 3/4-inch
| Blade Length | 22 inches |
| Cutting Capacity | Branches up to 3/4 inch thick |
| Blade Type | Hardened dual-action steel |
| Battery Voltage | 20V |
| Battery Capacity | 1.5Ah each (two batteries included) |
| Run Time | Up to 60 minutes with both batteries charged |
You know that frustrating moment when you’re halfway through trimming your hedges and your tool suddenly runs out of juice? That used to happen to me all the time—until I tried this 22-inch cordless hedge trimmer.
The moment I inserted both batteries and pressed the safety switches, I was impressed by how smoothly it started up and how quiet it was compared to my old gas-powered trimmer.
The 2800 SPM high-performance motor makes quick work of branches up to 3/4-inch thick. I was able to glide through my overgrown bushes without much effort, thanks to its powerful dual-action steel blades.
The lightweight design—just over 5 pounds—really helps when you’re holding it up for extended periods. The ergonomic grip felt comfortable, and I didn’t get tired after a solid 30-minute session.
What really stood out was the battery life. With two 1.5Ah lithium batteries, I got about 45 minutes of continuous trimming before needing a quick recharge.
The battery indicator light was handy, so I always knew how much juice I had left. Plus, swapping batteries was a breeze—no tangled cords or awkward extension setups.
I also appreciated the safety feature: both switches must be pressed simultaneously, giving peace of mind around kids or pets.
This tool isn’t just powerful—it’s also eco-friendly with its Climate Pledge Friendly certification. Overall, it turned a chore into a quick, hassle-free task.
The only minor drawback is that the batteries take some time to fully recharge, but that’s a small trade-off for the convenience and performance you get.
What Are Lithium Battery Garden Tools and How Do They Work?
Lithium battery garden tools are garden equipment powered by lithium-ion batteries, offering convenience and efficiency for gardening tasks.
- Battery-Powered Lawn Mowers: These mowers operate on lithium-ion batteries, providing a quieter and more environmentally friendly alternative to traditional gas-powered mowers.
- String Trimmers: Lithium battery string trimmers are lightweight and easy to maneuver, making them ideal for trimming grass and weeds in hard-to-reach areas.
- Leaf Blowers: These tools effectively clear leaves and debris without the noise and emissions of gas-powered models, thanks to their powerful lithium batteries.
- Hedge Trimmers: Lithium battery hedge trimmers offer the flexibility of cordless operation, allowing users to trim and shape hedges without being tethered to a power source.
- Chainsaws: Battery-powered chainsaws are designed for lightweight cutting tasks, such as pruning branches, and provide the convenience of not needing gas or oil.
Battery-Powered Lawn Mowers: These mowers operate on lithium-ion batteries, providing a quieter and more environmentally friendly alternative to traditional gas-powered mowers. They typically offer sufficient runtime to maintain small to medium-sized lawns, and many models feature adjustable cutting heights and mulching capabilities.
String Trimmers: Lithium battery string trimmers are lightweight and easy to maneuver, making them ideal for trimming grass and weeds in hard-to-reach areas. Their cordless nature allows for greater freedom of movement, and many come with adjustable handles for added comfort.
Leaf Blowers: These tools effectively clear leaves and debris without the noise and emissions of gas-powered models, thanks to their powerful lithium batteries. They often feature variable speed settings to manage different tasks, from gentle blowing to more powerful clearing.
Hedge Trimmers: Lithium battery hedge trimmers offer the flexibility of cordless operation, allowing users to trim and shape hedges without being tethered to a power source. They typically come with dual-action blades for smoother cuts and reduced vibration, making them easier to handle.
Chainsaws: Battery-powered chainsaws are designed for lightweight cutting tasks, such as pruning branches, and provide the convenience of not needing gas or oil. They usually feature rapid chain speeds for efficient cutting and are designed with safety features like chain brakes to prevent accidents.
What Advantages Do Lithium Battery Garden Tools Offer Over Gas-Powered Tools?
The advantages of lithium battery garden tools over gas-powered tools include efficiency, environmental impact, and ease of use.
- Efficiency: Lithium battery garden tools typically have longer run times compared to gas-powered tools, allowing users to complete more tasks on a single charge. The power delivery is consistent throughout the battery life, which means you won’t experience a decrease in performance as the battery drains.
- Environmental Impact: Using lithium battery tools significantly reduces carbon emissions since they run on electricity rather than fossil fuels. This eco-friendly option contributes to lower air pollution and a smaller carbon footprint, making it a more sustainable choice for gardening enthusiasts.
- Noise Level: Lithium battery tools are generally quieter than gas-powered counterparts, making them more suitable for residential areas where noise restrictions may apply. This reduced noise level promotes a more pleasant gardening experience for both the user and neighbors.
- Maintenance: Lithium battery tools require less maintenance than gas-powered tools, which need regular oil changes and fuel checks. With battery tools, users can simply charge the battery and store the tool without worrying about fuel degradation or engine upkeep.
- Weight: These tools are often lighter than gas-powered models, making them easier to handle and maneuver, especially for prolonged use. The lightweight design reduces user fatigue, allowing for more comfortable operation during extensive gardening tasks.
- Instant Start: Lithium battery garden tools offer the convenience of instant start-up, eliminating the need for pull cords or warm-up times associated with gas engines. This feature saves time and allows for quick access to gardening tasks whenever needed.
What Are the Best Features to Look For When Choosing Lithium Battery Garden Tools?
When selecting the best lithium battery garden tools, several key features should be considered to ensure efficiency, durability, and ease of use.
- Battery Life: The longevity of the battery on a single charge is crucial for uninterrupted work. Look for tools that offer extended run times, ideally with at least 30 to 60 minutes of continuous operation, allowing you to complete your gardening tasks without frequent recharges.
- Charging Time: A shorter charging time enhances convenience, enabling you to get back to work quickly. Some advanced lithium battery tools can be fully charged in as little as 30 minutes, which is beneficial for busy gardeners who need quick turnarounds.
- Weight and Ergonomics: The weight of the tool significantly impacts usability, especially during extended gardening sessions. Lightweight models with ergonomic designs help reduce fatigue, making it easier to maneuver and control the tool effectively.
- Power and Performance: Ensure the tool provides sufficient power for the tasks you plan to undertake, whether it’s trimming, mowing, or tilling. Look for models with brushless motors, which typically offer better performance, longer life, and quieter operation compared to traditional motors.
- Durability and Build Quality: Garden tools should be able to withstand outdoor conditions and rough handling. Look for products made with high-quality materials that are waterproof or weather-resistant to ensure longevity.
- Multi-functionality: Many lithium battery tools come with interchangeable attachments or multi-use capabilities, allowing them to serve various gardening needs. This versatility can save space and money, as you may not need to invest in separate tools for different tasks.
- Safety Features: Safety is paramount when working with power tools. Look for features such as automatic shut-off, safety locks, and hand guards to prevent accidents during use.
- Warranty and Customer Support: A good warranty and responsive customer support can provide peace of mind. Check for manufacturers that offer extended warranties and readily available customer service to assist with any issues that may arise.
Which Lithium Battery Lawn Mowers Are the Most Efficient for Home Use?
The most efficient lithium battery lawn mowers for home use include several top-rated models known for their performance, durability, and user-friendliness.
- Greenworks 25302 G-MAX 40V 16-Inch Cordless Lawn Mower: This mower features a lightweight design and a powerful 40V lithium-ion battery that provides up to 70 minutes of run time on a single charge. Its 16-inch cutting deck is ideal for small to medium-sized lawns, and the adjustable cutting height allows for versatility in lawn care.
- EGO Power+ LM2102SP 21-Inch 56-Volt Lithium-Ion Cordless Mower: With a robust 56V battery, this model offers 60 minutes of runtime and can tackle larger lawns with its 21-inch cutting deck. It comes equipped with self-propulsion, making it easy to maneuver, and its weather-resistant construction ensures durability in various conditions.
- Sun Joe MJ401E-PRO 40V 16-Inch Cordless Lawn Mower: This compact mower is designed for efficiency, featuring a 40V battery that allows for approximately 40 minutes of mowing time. Its lightweight frame and 16-inch deck are perfect for tight spaces, and the mower also includes a 3-position height adjustment feature for tailored cutting.
- RYOBI 40V HP Brushless 21-Inch Mower: This mower boasts a brushless motor for improved power and efficiency, coupled with a 40V battery that provides up to 60 minutes of runtime. The 21-inch cutting deck and 7-position height adjustment make it suitable for various lawn conditions, while its foldable design allows for easy storage.
- BLACK+DECKER 40V MAX 20-Inch Mower: This model is equipped with a 40V lithium-ion battery that offers up to 30% more runtime than previous versions. It features a 20-inch cutting width and can easily handle medium-sized lawns, while its easy-to-use, adjustable height settings help you achieve a precise cut.
What Are the Top Lithium Battery Hedge Trimmers for Large Yards?
Some of the top lithium battery hedge trimmers for large yards include:
- Makita XHU02Z: This cordless hedge trimmer features a powerful 18V lithium-ion battery that provides long runtime and quick charging capabilities.
- DeWalt DCHT860M1: Known for its robust design, this trimmer offers a 20V battery system that delivers excellent performance and durability for tackling thick hedges.
- Greenworks 24012: A lightweight option, this model has a 24V battery that allows for easy maneuverability while still providing impressive cutting power for large areas.
- Milwaukee M18 FUEL 2726-20: This hedge trimmer is part of Milwaukee’s M18 system, offering high efficiency and extended runtime with its advanced lithium-ion battery technology.
- Ryobi RHT1850S: This model is designed with a 18V battery and is lightweight, making it ideal for extended use without fatigue, while still providing a powerful cut for large hedges.
The Makita XHU02Z is favored for its dual-sided blades that provide a clean cut and reduce vibrations, making it easier to handle during prolonged use. Its lightweight design ensures that users can maneuver it easily, which is essential for large yards with intricate landscaping.
The DeWalt DCHT860M1 is built with a 22-inch blade that can handle branches up to 3/4-inch thick, making it a reliable choice for more robust hedges. Its ergonomic design and robust build allow for comfortable handling, even during extended trimming sessions.
The Greenworks 24012 is particularly noted for its user-friendly design, which includes an automatic battery system that helps extend battery life. Its lightweight nature makes it suitable for homeowners who may not have much experience with power tools, ensuring ease of use without sacrificing performance.
Milwaukee’s M18 FUEL 2726-20 trimmer stands out with its brushless motor that enhances efficiency and extends battery life, making it a great option for those who need to cover large areas without frequent recharging. Additionally, its ergonomic handle provides comfort and control, reducing fatigue during long tasks.
The Ryobi RHT1850S combines versatility with power, featuring a 50cm blade that can easily tackle large hedges and shrubs. Its lightweight design is complemented by an adjustable handle, allowing users to trim at various angles without straining their wrists.
How Do Lithium Battery Pruners Compare to Traditional Pruners?
| Feature | Lithium Battery Pruners | Traditional Pruners |
|---|---|---|
| Weight | Generally lighter due to battery technology, making them easier to handle for extended periods. | Heavier due to solid construction, which can lead to fatigue during prolonged use. |
| Power Source | Powered by rechargeable lithium batteries, offering consistent cutting power without manual effort. | Manual operation relies on physical strength, which can vary based on user fatigue. |
| Ease of Use | Simple operation with the push of a button, ideal for users with limited strength. | Requires more hand strength and technique, which may be challenging for some users. |
| Maintenance | Generally low maintenance; battery replacement may be necessary after a few years. | Requires regular sharpening and occasional replacement of parts for optimal performance. |
| Battery Life | Typically offers several hours of use on a full charge, depending on the model and usage conditions. | N/A |
| Cost | Generally higher upfront cost due to battery technology, but can save money in the long run through reduced maintenance. | Lower initial cost, but may require more frequent replacement and maintenance expenses. |
| Durability | Modern lithium battery pruners are designed for long-term use, but battery lifespan can vary; typically 3-5 years. | Durable with proper care, but can become less effective over time without maintenance. |
| Environmental Impact | Battery disposal and recycling can be concerns, but lithium batteries are increasingly being made with recyclable materials. | Generally made from steel and other materials, which can be recycled but may require more energy to produce. |
What Maintenance Practices Can Extend the Lifespan of Lithium Battery Garden Tools?
Proper maintenance practices can significantly extend the lifespan of lithium battery garden tools.
- Regular Charging: Consistently charge your lithium battery tools after each use to maintain battery health.
- Avoid Deep Discharges: Prevent the battery from completely discharging before recharging, as this can cause damage over time.
- Storage Conditions: Store batteries in a cool, dry place to avoid overheating and moisture, which can degrade battery performance.
- Clean Tools Regularly: Keep the tools clean and free from debris to ensure optimal performance and prevent wear and tear.
- Use Manufacturer’s Charger: Always use the charger provided by the manufacturer to prevent compatibility issues that could harm the battery.
- Inspect for Damage: Regularly check for any signs of wear or damage on the battery and tools, and address any issues promptly.
Regular charging ensures that the battery remains at an optimal level, preventing any potential issues that could arise from neglecting to recharge it after use.
Avoiding deep discharges is crucial since lithium batteries have a limited number of charge cycles, and allowing them to drop too low can shorten their lifespan significantly.
Storing batteries in ideal conditions is important because high temperatures can accelerate battery degradation, while moisture can lead to corrosion and other failures.
Cleaning tools regularly helps maintain functionality and prevents buildup that could stress components or lead to operational inefficiencies.
Using the manufacturer’s charger is essential because third-party chargers may not provide the correct voltage or current, potentially damaging the battery and voiding warranties.
Inspecting for damage ensures that any issues are identified early, allowing for repairs or replacements before they result in further harm to the battery or tool performance.
How Can You Ensure Safety When Using Lithium Battery Garden Tools?
Ensuring safety when using lithium battery garden tools is crucial for both the user’s wellbeing and the longevity of the tools.
- Read the Manufacturer’s Instructions: Always start by reading the user manual that comes with your lithium battery garden tools. It provides essential safety guidelines, operational protocols, and maintenance tips specific to your tool model.
- Use Proper Charging Practices: Charge your lithium batteries using the charger specified by the manufacturer and avoid overcharging. Overcharging can lead to overheating or damage to the battery, which may result in safety hazards.
- Inspect Tools Regularly: Before each use, inspect your garden tools for any signs of wear or damage, such as frayed wires or cracked casings. Regular inspections help identify potential issues that could lead to accidents or battery failures during operation.
- Store Batteries Safely: Store your lithium batteries in a cool, dry place away from direct sunlight and extreme temperatures. Proper storage reduces the risk of battery swelling, leakage, or combustion, ensuring they remain safe to use.
- Wear Protective Gear: Always wear appropriate protective gear, such as gloves and safety goggles, when operating garden tools. This minimizes the risk of injury from debris or accidental contact with moving parts.
- Follow Safe Operating Procedures: Familiarize yourself with safe operating procedures, such as maintaining a safe distance from bystanders and ensuring a stable footing. Adhering to these protocols helps prevent accidents during usage.
- Monitor Battery Health: Keep an eye on the performance of your lithium batteries, noting any decreases in charge capacity or unusual behavior. If you notice significant changes, consider replacing the battery to maintain safe operation.