Honestly it does not matter what size boat unless you are concerned about where to put it in your boat, then yes, but you can get the dimensions from their website. But to answer your question. Skeeter ZX250
the difference in the amps is charge time of course 15 will charge faster than 10, but it also depends on how much the battery is depleted.
I fished FLW and practiced from daylight till dark, put them on charge and they where ready to go the next am.
I beleive 15amps will take 3-4 hours to charge and 10amps 6-8 hours, again depends on how much they were depleted. Hope this helps. I beleive this information is also on their website.
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