I have a pair of these Li-ion batteries. I'd like to couple them so that I get double the current. However, I realize that this could be a Bad Idea™, as the charge could flow in a loop through both batteries.
What is the best way to prevent this?
Should I add diodes in series with each battery? (if so, what type and value?)
Should I put a resistor in series with one of the batteries?
Or is there a better way?
Answer
The resistor solution has the main disadvantage that there can flow a (rather large) current from one battery to the other. This may reduce the life of the battery receiving the current (you're not properly "charging" it).
I would go for the diodes. If one battery's voltage is higher than the other this battery will be the only one supplying current, until both voltages are the same. From that moment both batteries will supply current.
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