The stock battery gets you to the hunting spot but not always back. The Bakcou 21Ah extended-range battery delivers 1,008 watt-hours of Panasonic cells in a direct drop-in replacement — more range per charge without any modifications.


Key Features
- 21Ah / 1,008Wh capacity for extended-range riding
- 48V Panasonic lithium-ion cells rated for 900+ charge cycles
- 6-pin connector — direct drop-in for all Bakcou fat tire models
- Does NOT fit Step-Through (ST) frames — top tube clearance required
Specifications
| Material | Panasonic lithium-ion cells |
|---|---|
| Capacity | 21Ah / 1,008Wh |
| Voltage | 48V |
| Cell Type | Panasonic lithium-ion |
| Connector | 6-pin drop-in |
| Charge Cycles | 900+ |
Frequently Asked Questions
Which Bakcou bikes does the 21Ah battery fit?
This battery fits all Bakcou fat tire e-bikes with 6-pin connectors: Storm G2, Scout, Mule SD, Mule Jäger, Flatlander SD, and Kodiak SD. It does NOT fit Step-Through (ST) frames.
How does the 21Ah compare to the 25Ah battery?
The 25Ah battery gives you about 20% more range (1,200Wh vs 1,008Wh) at a higher price. The 21Ah is the sweet spot if you want extended range without the top-tier cost.
How long does the 21Ah battery last?
Rated for 900+ charge cycles. At one full charge per week, that is over 17 years before the cells drop below 80% capacity.