Ya electric is cool and all and is making great strides but it's not there yet. Even a tesla loses what 20% battery at -10C? Tesla has a heater to heat up those batteries when its cold because they won't even work otherwise. I can kill a 5AH battery drill in a half hour if used really hard - 18V mind you. Point being, with batteries they have a very precise point in which they like to run and when run hard they do not last and they lose charge capacity each and every time they are run below optimal (typically 20-30%) although new batteries, such a tesla I believe is 5%.
Something like this
This product is no longer available.
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with this
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PS. The alibaba is for information only. Don't buy from there if you don't know what your doing. It's like the dark web of products LOL