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Hi,
I have 2 Gel 20 ah batteries, they still take a good charge after nearly 8 years and are quite compact. However they weigh around 9kg each.
I recently bought a new Fusion LiFeP04 (Lithium Iron Phosphate) rated at 30 ah at 12v. It's the same size/format as the gel battery but only weighs 2kg. It powered my AZEQ6 all night (plus a powered hub, starlight focusser and zwo camera) and only used around 20% charge. Unlike the Gel I can run it down to around 20% capacity and it supplies a full 12 volts all the way down.
Cheers
Paul
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