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G'day Christian,
We need a bit more info.
What brand and type of battery charger do you have, if it is the 2x voltage type, that is, 6 and 12 volt, make sure it is set at 12 volt.
Now take a voltage reading of your battery with nothing connected and note.
Connect battery charger and you should see battery voltage rise to at least 13 plus volts within first few minutes.
Keep recording voltage at 15 minute or so intervals for a couple of hours.
Let us know the results.
Steve
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