Start simple...car battery, or borrow from your lawn tractor.
Small charge controller selected for min RFI.
If the kid can concentrate on a job, salvage 18650 cells from old laptop 
batteries and build packs of whatever size you need.
"Dead laptop batteries usually have just a couple of bad cells and some shops 
will give/sell them cheap.
Ebay has the plastic hardware for assembling packs without duct tape.
Get single cell chargers from ebay for initial conditioning.
There's a lot of potential learning here!
73,
Wilson
W4BOH
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