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Hi gurus. I bought this little battery protection board and wired up 2 18650 batteries per the attached diagram but get no power at the "P" side. When I attached the batteries at the P side, the B side has power. Can any guru tell me what I'm doing wrong please?
You may have to connect the P side to a charger temporarily to get the electronics to switch on.
Also note that the board appears to provide undervoltage / overvoltage protection, but not balance - you must also have balance for the cells to properly charge as a pair, otherwise charging will stop as soon as either cell reaches maximum voltage.
It's OK as it is if you are using a battery holder and charging the cells separately.