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Unfortunately this is a very vague description, can you give us more information like pictures, a schematic, model numbers, etc?
If I understand correctly the op wants to run this off a 9v power supply (wall wart) and charge the battery at the same time.Short answer is no not without a charge controller.
Quote from: bills on October 05, 2015, 01:47:21 amIf I understand correctly the op wants to run this off a 9v power supply (wall wart) and charge the battery at the same time.Short answer is no not without a charge controller.Ok, that makes a lot more sense, thanks!You can run it from a wall-wart, just add the appropriate connector to the board, make sure polarity is right, and use it that way. As others have said, both charging and running the meter at the same time would require additional circuitry.