Blomiky 2 Pack 7.4V 1200mAh 8.88Wh Li-PO Battery and 2 USB Charger Cable Replacement for 1/18 Scale 9310YL 9300 9301E 9302E 9303E 9304E 9305E RC Truck / 9300 1200 2

Good info. Ignore the person telling you to get a NiMH stick pack. That would never fit. You need a liPo with a small Tamiya plug. The little white plug is a balance connector. It charges each cell independently to keep them in balance. The important thing is to match the physical dimensions and the voltage, 2s 7.4v. You can probably just purchase that same battery from DeerRC, or some acceptable battery from Amazon, etc. You can check the physical dimensions on this link and see if they'd fit. You can probably also order the original replacement batteries on AliExpress. Just search 850mAh deerrc lipo. https://a.co/d/0jdEI2ya