Top Rated String Trimmer Batteries for Serious Landscaping
For most professional landscapers, the Greenworks 80V Pro 2.0Ah battery stands out as the top pick because it offers the best balance of power and runtime while remaining lightweight and compatible with a wide range of Greenworks Pro tools. Its main advantage is the 80V architecture that delivers consistent power and longer runtime than standard 40V batteries, yet it still fits comfortably in most trimmers. The main limitation is that it requires a Greenworks Pro charger, which is sold separately if you are not already in the Greenworks ecosystem.
A dead battery in the middle of a job is every landscaper’s nightmare. Choosing the right replacement battery for your string trimmer is crucial for maintaining productivity and avoiding downtime. This roundup compares the most reliable and popular batteries on the market, focusing on performance, compatibility, and longevity.
We looked at batteries from major brands like Greenworks, EGO, DeWalt, Milwaukee, and more. Each battery was evaluated for its real-world performance based on specifications and owner feedback. Whether you need a lightweight battery for quick trimming or a high-capacity option for large properties, this guide will help you make an informed decision.
What we recommend
Greenworks 80V Pro 2.0Ah Battery
This battery delivers reliable power with a lightweight design. Owners appreciate the consistent runtime and fast charging. It works with a wide range of Greenworks Pro tools, making it a versatile investment.
Pros
- Lightweight and balanced
- Fast charging with compatible charger
- Works with multiple Greenworks Pro tools
Cons
- Requires Greenworks Pro charger (not included)
- Lower capacity than some competitors
EGO Power+ 2.5Ah Battery
The EGO Power+ battery is known for its durability and long lifespan. It features a fuel gauge and is compatible with all EGO 56V tools. Users report minimal power fade even after hundreds of charges.
Pros
- Excellent battery life
- Rugged build quality
- Clear fuel gauge indicator
Cons
- Higher price point
- Only works with EGO tools
DeWalt 20V MAX 5.0Ah Battery
This battery is a powerhouse for DeWalt 20V MAX trimmers. It offers high capacity and is compatible with over 200 DeWalt tools. Landscapers who already use DeWalt will benefit from interchangeability.
Pros
- High capacity for extended runtime
- Works with many DeWalt tools
- Reliable performance
Cons
- 20V may not deliver enough power for heavy commercial use
- No charge level indicator on the battery itself
Milwaukee M18 REDLITHIUM HIGH OUTPUT 6.0Ah Battery
Milwaukee’s HIGH OUTPUT battery runs cooler and delivers more power than standard XC batteries. It is designed for demanding applications and works with all M18 tools, including string trimmers. Owners praise its longevity and rapid charge capability.
Pros
- High capacity and power output
- Runs cooler for extended life
- Compatible with all M18 tools
Cons
- Heavier than some competitors
- Premium price; requires M18 charger
Ryobi 40V 4.0Ah Battery
This Ryobi battery offers a solid balance of price and performance. It is compatible with a range of Ryobi 40V outdoor tools. Users report good runtime for typical residential trimming tasks.
Pros
- Affordable price
- Good runtime for average use
- Works with many Ryobi tools
Cons
- Battery life may degrade over time
- Not as powerful as 80V systems
Greenworks 40V 5.0Ah Battery
This battery provides a higher capacity for Greenworks 40V trimmers. It is ideal for larger yards or commercial jobs where longer runtimes are needed. Owners appreciate the low self-discharge rate.
Pros
- Extended runtime
- Low self-discharge
- Compatible with many Greenworks tools
Cons
- Heavier than smaller capacity batteries
- Charging time can be long
Makita 18V LXT 5.0Ah Battery
Makita batteries are known for their durability and reliable power. This 5.0Ah battery offers a good balance of capacity and weight. It is compatible with all Makita 18V LXT tools, including string trimmers.
Pros
- Lightweight and compact
- Proven reliability
- Fast charging with LXT charger
Cons
- Lower voltage may not suit heavy commercial trimmer use
- No charge indicator on the battery
How to choose
The lineup, side by side
| # | Model | Voltage | Best for | Score | Price |
|---|---|---|---|---|---|
| 1 | Greenworks 80V Pro 2.0Ah Battery | 80V | Best overall for most landscapers | 9.4 | Check price |
| 2 | EGO Power+ 2.5Ah Battery | 56V | Best for EGO string trimmers | 9.2 | Check price |
| 3 | DeWalt 20V MAX 5.0Ah Battery | 20V | Best for DeWalt 20V trimmers | 9.0 | Check price |
| 4 | Milwaukee M18 REDLITHIUM HIGH OUTPUT 6.0Ah Battery | 18V | Best for heavy-duty professional use | 8.8 | Check price |
| 5 | Ryobi 40V 4.0Ah Battery | 40V | Best value for homeowners and light commercial | 8.6 | Check price |
| 6 | Greenworks 40V 5.0Ah Battery | 40V | Best extended runtime for Greenworks 40V | 8.4 | Check price |
| 7 | Makita 18V LXT 5.0Ah Battery | 18V | Best for Makita 18V trimmers | 8.2 | Check price |
Frequently asked questions
What voltage battery do I need for a string trimmer?
It depends on your trimmer. Most electric string trimmers use 18V to 80V. For residential use, 40V is common. For commercial landscaping, higher voltage like 80V offers more power. Always check your trimmer’s manual for the required voltage.
Can I use a higher Ah battery in my trimmer?
Yes, if the voltage matches, a higher Ah battery will fit and provide longer runtime. It will be heavier, but it will not damage the trimmer. The trimmer draws only the current it needs.
Are all batteries from the same brand interchangeable?
Generally, batteries within the same voltage family are interchangeable. For example, all Greenworks 40V batteries work with Greenworks 40V tools. However, check compatibility with your specific tool model, as some older tools may not be compatible with newer batteries.
How long does a string trimmer battery last per charge?
Runtime varies based on battery capacity, trimmer efficiency, and cutting conditions. A 2.0Ah battery might last 20-30 minutes, while a 5.0Ah can last over an hour. Commercial use may drain faster.
Can I leave my battery in the trimmer when not in use?
It is not recommended. Storing the battery attached to the tool can cause a slow discharge and may shorten battery life. Remove the battery and store it in a cool, dry place.
How do I know when to replace my trimmer battery?
If the battery no longer holds a charge, takes much longer to charge, or delivers significantly less runtime, it is time to replace it. Also, physical damage or swelling indicates immediate replacement.
Are lithium-ion batteries better than NiCad for trimmers?
Yes, lithium-ion batteries are lighter, have higher energy density, and do not suffer from the memory effect. They also hold a charge longer when not in use.
What is the best way to store a battery for winter?
Store the battery at a partial charge (around 50%) in a cool, dry place. Avoid extreme temperatures. Recharge it periodically to prevent deep discharge.
Our pick
For most landscaping professionals using Greenworks equipment, the Greenworks 80V Pro 2.0Ah battery is the clear winner because it combines lightweight design with robust power. If you are invested in the EGO system, choose the EGO Power+ battery for its outstanding durability. For those seeking a versatile option that works across many tools, the DeWalt 20V MAX 5.0Ah is a smart choice. Ultimately, stick with the battery brand that matches your trimmer to ensure seamless performance and safety.
Sierra Daniels
Sierra's background is in landscape design and nursery retail. She focuses on lawn and garden equipment, outdoor furniture and gear durability, weighing published specs against how materials actually hold up outside.
