The battery uses LiFePo4(Lithium Iron Phosphate) chemistry, which has a tremendous power to weight ratio. Its the same battery technology as used in the worlds fastest electric drag motorcycle killacycle. I haven't cracked open the case(its thermo sealed) to check if they are actually A123 cells(generally considered the best LiFePo4 cells), but it does the job quite well.
It is not relying on alternator alone with a small battery. The battery will be slightly discharged after cranking, but will get topped off quickly by the alternator. Voltage gauge reads 14.4 while engine is running.
At this size it doesn't have nearly the capacity (amp hours) of a full size lead acid, but short bursts is what it excels at. The only risk with lower capacity is that you could drain it fairly quickly if you aren't careful. Just don't run electrical without the engine on.
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