But the photo voltaic gentle is probably just trickle-charging the battery, and if you have one of the same chemistry and roughly the identical capability, it’s going to probably be fine. However, going to something like 60 mAh or 6000 mAh is extra prone to lead to problems that might harm the battery or your different circuitry. Anyway, in case your 2 Ah battery lasts about 6 minutes (1/10 of an hour), your motor draws about 20A.
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