https://electronics.stackexchange.com/questions/223366/tp4056-lithium-charger-module-issue Link PLS here. http://phuclanshop.com/module-sac-pin-lithium-18650-va-tich-hop-tang-ap-dc-boost http://phuclanshop.com/mach-sac-bao-ve-pin-18650-2s-20a-co-can-bang I'm not going to try to answer all parts of your description, since part of the problem is that the charger is being used incorrectly. Only after that is resolved, might it be worth investigating the second behaviour. 1. Those charger boards from Ebay cannot be relied upon to work (a) correctly, and (b) safely. They typically appear to use the TP4056 ( allegedly based on the Linear Technology LTC4056). The TP4056 has itself been cloned, with some not stopping charging the battery at the correct voltage, for example. Here is one engineer's experiences, with comments from other people where TP4056 chips (or clones) didn't behave as expected: http://jimlaurwilliams.org/wordpress/?p=4731 2. Even if that...