What make of battery is it?
What kind of charger are you using?
Unless it's a modern smart battery charger you have to be careful when you put a battery on charge that doesn't really need charging as some of the older type chargers will just ruin the battery in a short space of time.
The battery gauge on the dash can be adjusted BUT you need the BT can service key & to know the Ah rating of the battery plus follow the instructions in the service manual to get it correct, again if you get the setting wrong it can ruin the battery in the long run.
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