I don't quite understand what you mean. You should use two batteries at the same time to extend the usage time. In this case, connect the two batteries in parallel (if connected in series, the voltage will increase. Be careful of hot objects.) The positive terminal is connected. Connect the positive electrode and the negative electrode to the negative electrode, and also connect the power detection electrode in the middle. It is the equivalent of a battery, but the capacity is doubled (the same two batteries)
How to combine two lithium batteries
Introduction How to assemble two lithium batteries? I don't quite understand what you mean. You should use both batteries at the same time to extend the usage time. In this case, connect the two batteries in parallel (series connection).