What is the highest charge current that I can use without fear of Lithium battery damage?
Never exceed the max charge current given in the cell spec. For example, for a Lithium ion battery, 2400mAh cell, with a max specified charge current of 1C, never exceed 2.4A CC mode charge current unless the cell specification clearly states this is an acceptable rate. Besides the maximum allowable charge rate many manufacturers provide a “suggested” charge rate to maximize battery life. In addition, we rarely see Lithium batteries that can be charged at the maximum current in the cell spec because of heating in the pack and surrounding electronics. In our experience, it is not unusual to see a 5C to 10C rise inside Lithium battery pack during charge. Since you often must shut down charge at 45C, and you normally get 5C to 10C rise due to charger-battery generated heat, you’re down to 25C – 35C max ambient temperature as the practical charging window. In a software-controlled smart battery charger, you can vary the charge current relative to the Lithium battery temperature to minimize
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