STIHL AP 20.1 Battery 4850 400 6526 | 36V 144Wh ALLPRO/AP Battery
Product Number: 4850 400 6526
Have Questions?
Our experts are here to answer your questions!

STIHL AP 20.1 Battery - 4850 400 6526
The STIHL AP 20.1 Battery, part number 4850 400 6526, is a 36V lithium-ion battery designed for the STIHL ALLPRO/AP cordless power system. Built as a great entry point into the STIHL ALLPRO battery lineup, the AP 20.1 delivers dependable power, flexible compatibility, and strong value for homeowners, property owners, and professional users.
With intelligent battery electronics, Power Boost, Constant Power, 4 LED charge indicators, and splash protection, the AP 20.1 is built for a wide range of landscaping, trimming, property maintenance, and outdoor power equipment tasks.
This battery is commonly searched as STIHL AP 20.1, STIHL AP 20.1 battery, STIHL 4850 400 6526 battery, STIHL ALLPRO battery, STIHL AP battery, or STIHL 36V battery.
Product Details
| Brand | STIHL |
|---|---|
| Model | AP 20.1 |
| Part Number | 4850 400 6526 |
| Product Type | Lithium-Ion Battery |
| Cordless Power System | ALLPRO/AP |
| Rated Voltage | 36 V |
| Maximum Voltage | 40 V |
| Energy Content | 144 Wh |
| Rated Capacity | 3.90 Ah as per IEC 61960 |
| Rated Cell Capacity | 2 Ah as per manufacturer data |
| Battery Weight | 1.3 kg |
| LED Indicators | 4 LEDs |
| Dimensions | 116 mm W x 164 mm H x 70 mm L |
| Water Resistance | IPX4 splash protection where specified |
Key Features
- Genuine STIHL AP 20.1 battery
- Part number 4850 400 6526
- 36V rated voltage with 144 Wh energy content
- Designed for STIHL ALLPRO and AP cordless power systems
- Great entry point into the STIHL ALLPRO battery system
- Power Boost function provides extra output when paired with compatible STIHL tools
- Constant Power technology helps maintain strong performance throughout the charge
- Intelligent electronics help protect the battery during overload situations
- 4 LED charge indicator lights
- IPX4-rated splash protection where specified
- Designed for up to 1,200 charge cycles where specified
Reliable ALLPRO/AP Battery Power
The STIHL AP 20.1 is designed for users who want dependable cordless power in a versatile battery platform. It is ideal for common landscaping, trimming, cleanup, and property maintenance tasks when paired with compatible STIHL AP or ALLPRO tools.
Power Boost Performance
With Power Boost, compatible STIHL tools and batteries communicate through internal intelligent electronics. When the tool and battery both support the Power Boost function, the battery can provide additional power for tougher applications while helping protect battery life.
Constant Power Technology
The STIHL AP 20.1 is designed with Constant Power technology to help maintain strong output throughout the battery charge. Compatible STIHL cordless tools are engineered to keep performance consistent instead of gradually losing power as the battery discharges.
Built-In Battery Protection
Intelligent electronics monitor battery performance and can adjust output in overload situations. This helps protect the battery, reduce stress during demanding work, and support long-term reliability.
Compatible Battery System
The STIHL AP 20.1 is part of the STIHL ALLPRO/AP cordless power system. It is designed to work with compatible STIHL ALLPRO and AP system tools where approved by STIHL.
Always verify your STIHL tool model, battery requirements, charger compatibility, and owner’s manual before ordering.
Important Compatibility Notes
- This listing is for STIHL part number 4850 400 6526
- Battery model: AP 20.1
- Designed for the STIHL ALLPRO/AP cordless power system
- Verify your STIHL tool accepts AP or ALLPRO batteries before ordering
- Confirm charger compatibility before use
- Runtime and performance vary by tool, workload, temperature, battery age, and operating conditions
- Do not order by battery series alone without confirming tool and charger compatibility
When to Choose the AP 20.1 Battery
- You want an entry-level STIHL AP/ALLPRO battery option
- You need a battery for trimming, maintenance, and everyday property care
- You want a balance of value, compatibility, and dependable runtime
- You are building a STIHL AP or ALLPRO cordless equipment lineup
- Your STIHL tool manual lists AP system battery compatibility
Part Number / Search Terms
- STIHL AP 20.1
- AP 20.1 battery
- STIHL AP20.1 battery
- STIHL 4850 400 6526
- STIHL 48504006526
- 4850 400 6526 battery
- STIHL ALLPRO battery
- STIHL AP battery
- STIHL 36V battery
- STIHL 144Wh battery
- STIHL Power Boost battery
- STIHL Constant Power battery
- STIHL cordless tool battery
- STIHL AP system battery
Frequently Asked Questions
What is the STIHL AP 20.1?
The STIHL AP 20.1 is a 36V lithium-ion battery with 144 Wh of energy content for the STIHL ALLPRO/AP cordless power system.
What is the part number for the STIHL AP 20.1?
The STIHL part number is 4850 400 6526.
What battery system does the AP 20.1 fit?
The AP 20.1 is designed for the STIHL ALLPRO/AP cordless power system. Always verify compatibility with your exact STIHL tool and charger before ordering.
Does the AP 20.1 have Power Boost?
Yes. When paired with compatible STIHL tools that support Power Boost, the AP 20.1 can provide extra output for tougher applications.
Is the AP 20.1 water resistant?
The AP 20.1 is listed with IPX4-rated splash protection where specified.
Can I use this battery with every STIHL cordless tool?
No. Always verify your exact STIHL tool model, battery requirements, charger compatibility, and owner’s manual before ordering.
California Proposition 65 Warning
WARNING: This product contains chemicals known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.
P&P Small Engines stocks STIHL batteries, chargers, cordless tools, replacement parts, accessories, chains, bars, trimmer line, and professional outdoor power equipment.





Connect with us