I use 12v 3ah rechargeable li-ion battery, pretty small battery too, for my Motored bike Light system, they stay charged for 14-16 days used 1hr daily. My question is this, if I obtain the same 12v li-ion battery but with a 20Ah and wire them in series would it power an ebike, and would it have increased mileage range.
PS. This battery is 9inches long 4 inches wide, and it's depth is around 2inches, used in surveillance cameras, and other such devices, to power electronics. The 20ah is slightly bigger but same style, in a rectangle shape.