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the small 3.2 amp hour batteries would be great for an electric bicycle, or if you got about 300 of them they would work for an electric car... if all of your connections were perfect, if they are not perfect then your charging and discharging will not be even and you will wear some batteries out faster then others causing them to fail high amp hour batteries are the best way to go, then string them together for hgher voltage, the higher the voltage the smaller the wire can be in the motor so the more power you can get out of it, thus higher speeds, my 48v 1,400 pound car needs battery cables that are at least 0 gauge, my new cabes are 00 gauge, over 1/2" of copper conductor, with low voltage like that you start needing such large wire and switches that it limits you, of course low voltage is nice because I can grab the battery cables and feel it but not be killed, anything much over 48volts can badly burn, hurt or kill you.
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