I think it is time for a new battery.

camdon44

Member
Region
USA
My wife rides a Black Max 20 inch fat tire folding bike. The battery is 48 volts and 14ah. Where in the world would I be able to find a replacement battery??
 
Similar. Her's is not the step through. It is one of the original Black Max folders... Battery should be the same.
 
That looks like a Silverfish. Quite common on the third party marketplace. The important parameters are the location of the output pins. Most of the newer units have the output on the bottom. I have one, and it's two pins that go into a receptacle that can hold four.

Polarity is not guaranteed to be a standard. You should look at the positive (+) and negative (-) markings on your battery, and verify that the replacement is the same. An adventurous person can easily change them, but it's best to buy the same.

Replacements vary a little in height, but you will see that the battery is held by a metal bracket which can be adjusted up/down so not a problem.

You'll find them on ebay and amazon under 48V Silverfish. They're like commodity items in that marketplace. Anything from 13aH to 17ah will work. You get a better range with the higher aH.

As to which one to buy, you're on your own. Good luck,
 
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