Thank you - now I understand: all is becoming clearer.
Reviewing what has been written so far then, it seems that you originally connected these batteries to a USB port via a 'mini-charger'. There have been several comments about the current-capacity of a USB port for this purpose, generally implying, or stating - that the current available from that port will be insufficient to cause damage - or overheating - of those batteries.
However, that then gives rise to the following question: what is in that 'mini-charger' and what is its output voltage on no-load and what is its output current capacity? These figures may not be directly related to the corresponding figures for the USB port that powers it: the mini-charger may incorporate some form of voltage step-up for all I know (thinks: SMPS inside the mini-charger?). This, in turn, may produce a charging voltage that is in excess of that required, and if that rated output current is available at that excessive on-load voltage . . . the batteries will be over-charged . . . and get hot . . . possibly really hot!
Just a few thoughts that may help.
Al.
Reviewing what has been written so far then, it seems that you originally connected these batteries to a USB port via a 'mini-charger'. There have been several comments about the current-capacity of a USB port for this purpose, generally implying, or stating - that the current available from that port will be insufficient to cause damage - or overheating - of those batteries.
However, that then gives rise to the following question: what is in that 'mini-charger' and what is its output voltage on no-load and what is its output current capacity? These figures may not be directly related to the corresponding figures for the USB port that powers it: the mini-charger may incorporate some form of voltage step-up for all I know (thinks: SMPS inside the mini-charger?). This, in turn, may produce a charging voltage that is in excess of that required, and if that rated output current is available at that excessive on-load voltage . . . the batteries will be over-charged . . . and get hot . . . possibly really hot!
Just a few thoughts that may help.
Al.
