Keeppower 18650 3500mAh P1835U (White-blue) 2020
![DSC_4140](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4140.jpg)
Official specifications:
- Minimum Capacity: 3350mAh
- Nominal Capacity: 3500mAh
- Nominal Voltage: 3.7V
- Discharge End Voltage: 2.5V
- Standard Charging Current: 1.0A
- Max. Continuous Discharging Current: 5A
- Built in micro-usb charge port
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-info](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-info.png)
A 3500mAh protected 18650 with build-in USB-charger.
![DSC_4139](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4139.jpg)
![DSC_4142](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4142.jpg)
![DSC_4143](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4143.jpg)
![DSC_4144](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4144.jpg)
![DSC_4146](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4146.jpg)
![DSC_4147](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/DSC_4147.jpg)
A pack contains two batteries and a dual usb charge cable.
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Capacity](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Capacity.png)
The two cells tracks nicely and can handle more than 7A before getting too hot or protection will kick in.
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Temp-7.0](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Temp-7.0.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Temp-10.0](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Temp-10.0.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-CapacityTimeHours](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-CapacityTimeHours.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-CapacityTime](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-CapacityTime.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Energy](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Energy.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-PowerLoadTime](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-PowerLoadTime.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-TripCurrent](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-TripCurrent.png)
![Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Charge](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020/Keeppower%2018650%203500mAh%20P1835U%20(White-blue)%202020-Charge.png)
It looks like the USB charger reduces current probably due to temperature at the start of charging.
![USB%20Charge%20Test%2020201215030539](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20%28White-blue%29%202020/USB%20Charge%20Test%2020201215030539.png)
![Discharge-Keeppower%2018650%203500mAh%20P1835U%20%28White-blue%29%202020-pulse-1.0%2010%2010-IR%20backup](https://lygte-info.dk/pic/Batteries2012/Keeppower%2018650%203500mAh%20P1835U%20%28White-blue%29%202020/Discharge-Keeppower%2018650%203500mAh%20P1835U%20%28White-blue%29%202020-pulse-1.0%2010%2010-IR%20backup.png)
Conclusion
A good protected battery with good capacity, the USB charging can be useful on the go or if you only have a few 18650 batteries.
Notes and links
The batteries was supplied by Keeppower for review.
How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries