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You may have seen some ads here for the product "Booster Battery" for the SONDORS eBikes. We highly warn against these batteries they are really dangerous. Connecting two different batteries together may/will cause the weaker battery to drain first to the point where voltage becomes zero, at this point the battery will be damaged forever with no way to repair it. That may be fine for some of you but, here comes the dangerous part. The larger battery will continue to draw from the weaker battery which have already been exhausted and it will get extremly hot - a extremly hot and exhausted battery will explode and burst into flames. You are getting yourself and other lives in danger when you're connecting two batteries that are not the same voltage and amp hour. You might have been doing this with no negative effect yet but obviously you have not done long term testing. If it was this simple, someone would have done this along time ago. Lithium batteries in general are extremly explosive and highly flammable especially when you are not utilizing it properly. Here's a video of what happens when lithium batteries get hot: