Both the batteries for my Radwagon are on the fritz. One the LCD light went dead but the power works. The other has a full charge but wont turn on, the tail light works though so it has juice. Only had them under 2 weeks.
That's good! Just trying to offer an avenue to a solution. Many of the folks that come here don't own or know how to use a multi tester. No shame in that. I know a person that repairs laptops and he has broadened his scope of work to include Li-ion batteries from consumer products. I showed him the batteries from my bikes and he's looking into it to see if the ebike battery market is in need of repair techs. It's a great avenue for those that don't have a local ebike shop, or just don't deal with those type of issues.
... I'm planning to take the battery case apart when the new case comes in the mail, so I will check all the readings then with my multi-meter and perform a physical inspection to see if there was any damage done.