Quote:
Originally Posted by GadgetKen
The big (and very heavy) ones really will start a car or a tractor. They have a sealed lead acid gel cell inside. Issue can be when the gel cell can't be recharged anymore...you need to get a replacement that fits or buy a complete new unit. In the US, MCM Electronics and some other vendors carry compatible gel cells.
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The ones I am talking about are a little bigger than smart phones and use Lithium-Ion batteries.