The case has room for 2 batteries. Could you modify this to charge 2 batteries at the same time?
No, since you need a balance controller to safely charge multiple batteries at once, but you could upgrade to the larger size battery that it twice as big as the one in the project. =D
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You technically could wire them in parallel if they were exactly the same batteries (model, brand, capacity, voltage, etc.), but you should do a little research in order to fully understand the risks of doing so.