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Jan Buchwald

Hello Erik
13 Ah means, as you say, that it should be able to deliver 13 Amp’s for an hour.
Watt = Volt X Amp
or the other way
Amp = Watt/Volt
Are you sure you don’t have a shortage somewhere.
And that you are connecting the amp. meter in series with the bulp?
Not across the battery, that’s the voltmeter you use that way.
When no user is attached, there should be no amp reading.
1,5mm2 is not enough, try to measure the voltage from end to end of the wire, while you push your 10 amp’s through.
2,5 – 3 mm2 would be more appropriate.
The biggest fault in 6 V wiring, is loss in the wires.