What should a 3.7 V battery read when fully charged?

4.2V

The usual lithium battery cell is 3.7V, the voltage is 4.2V when fully charged, and the nominal voltage after series connection is 7.4V, 11.1V, 14.8V…

Catl 3.7v 145ah deep cycle rechargeable lithium ion lifepo4 battery cells

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