Redcat Racing HX-3800MH-B Version 4.0 3800 Ni-MH Battery-7.2V with Banana Connector 3800 Ni-MH Battery - 7.2V with Banana 4.0 Connector HX-3800MH-B With Banana 4.0 Connector Tools and Accessories : HX-3800MH-B For troubleshooting and warranty information please contact a Redcat Racing Customer Service Specialist at 602-454-6445 or by emailing amazonsupport@redcatracing.com NOTE: Please read the User Manual before use.