HQRP 7.2V Battery Compatible with Marshall Kilburn II, Kilburn II V2 Portable Bluetooth Speaker C196A1 7252-XML-SP, 7-Pin - Walmart.com
TF18650-2200-1S4PA Battery for Marshall Kilburn Speaker 14.8V 2600mAh
Amazon.com: Cameron sino Replacement Battery for Marshall Kilburn II, Kilburn II V2, fits Part No C196A1, TF18650-3200-4S2PA, 7.4V Li-ion 6400mAh / 47.36Wh : Electronics