Ampace JP40 – Built Tough for High-Drain DIY Projects

If you’re building a powerful e-bike, tool pack, or custom energy rig, the Ampace JP40 is your go-to cell. With a massive 70A pulse discharge and fast charge support, it’s built to handle extreme output without compromising longevity.

4000mAh Capacity: Plenty of runtime in a single 21700 cell
Up to 70A Peak: Delivers huge power bursts when needed
4A Standard Charge / 8A Fast: Recharge faster, build smarter
600+ Cycle Durability: Excellent performance retention over time
Ready for Cold or Heat: Works from -30°C to 75°C

SPECIFICATIONS

Manufacturer:	Ampace
Model:	JP40
Size:	21700
Positive Terminal:	Flat Top
Nominal Capacity:	4000mAh
Continuous Discharge Rating (max):	60A (No Temperature Cut-off) / 70A (With Temperature Cut-off)
Nominal Voltage:	3.7V
Maximum Voltage:	4.2V
Discharge cut-off Voltage:	2.5V
Protected:	NO, UNPROTECTED.
Pulse Discharge (5s):	140A
Standard Charge Current:	4A
Fast Charge Current:	8A
Cycle Life:	≥2400mAh after 600 cycles @ 30A / ≥2400mAh after 400 cycles @ 40A
Operating Temperature:	-30°C to 75°C (Discharge) / 0°C to 60°C (Charge)
Rechargeable:	Yes
Approx. Dimensions:	21.1mm x 70.1mm
Approx. Weight:	68g
Country of Origin:	China
Data Specification Sheet:	Ampace JP40 21700 Li-ion Battery Datasheet

Ampace 21700 Batteries

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Ampace JP40 21700 4000mAh 70A Tabless Battery