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Possible solutions:
1 x 44Ah sealed-lead-acid ---------------------- ~10kgs / 22lbs
2 x 12Ah AGM + supercaps ------------------- 8.7kgs / 19.2lbs
no wooden box or hardware
1 x 20Ah AGM + supercaps ------------------- 8.0kgs / 17.7lbs
2 x 14Ah AGM + supercaps ------------------- 9.7kgs / 21.4lbs
Ideally it should be
2 x 16Ah lithium + supercaps ---------------- 7.4kgs / 16.35lbs
But this last one is out of the acceptable price range for just an experiment...
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