You could get a replacement JST connector and a JST crimping tool, but since you can get a replacement battery for $10 https://www.amazon.com/dp/B016DD1GT6 (although several weeks for shipping, or from EZ-Robot faster, but more expensive and more expensive shipping).

Other batteries may be available on Amazon or local hobby shop. The specs you are looking for are:
1300mAh 2S 7.4V 25C with a DEANS connector (DEANS connects to the robot, JST to the charger).

This one would work too... https://www.amazon.com/Zippy-Compact-1300mAh-Battery-XT-60/dp/B00WFHM53Q free 4 day shipping for Prime members, although they are currently showing just one in stock.

The cheapest JST crimp tool I can find is ~ $14 https://hobbyking.com/en_us/hobbyking-jst-sh-connector-crimping-tool.html you might just want to replace the battery (also crimping new connectors on the batteries can be tricky. If you short the wires, they get explody...).

If you have a local makerspace, they probably have a crimp tool you can use, which changes the math....





Alan

Thank you Alan! This is perfect!

If you post a picture you might be able to do it with a small slot screw driver and a little finicky work.

Thanks so much!