BLD 18650 3800mAh USB (Green)



Official specifications:

• Product name: 18650 USB Rechargeable Li-ion Battery
• Model: 18650
• Type: Lithium Battery
• Appearance Capacity: 3800mAh/4200mAh
• Voltage: 3.7V
• Green Colour
• Weight: 34g
• Dimensions: 67 x 18 mm (length x body diameter)(without protected board)

A USB rechargeable LiIon battery, based on a 18500 cell with 3800mAh, no way















The capacity is lower than I expected and it cannot handle much current either, but at least the two tested batteries are equally bad.

















This is charging with a normal LiIon charger.



This is charging from the USB connector with a 5V supply, the two charge circuit is not perfectly matched in voltage, but easily withing the usual tolerances.



Conclusion

This is not exactly good batteries, they are rather bad with only 700mAh and only up to about 2A current. The USB charging works and do not need a cable.

They may be usable for some low power 18650 devices where USB charging is needed, but there is much better batteries with build in USB charger.



Notes and links

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