RYOBI 36 V MAX POWER 4.0 Ah Lithium + Battery BPL3640D2 (Compatible with All RYOBI 36 V MAX POWER Garden Tools, Battery Charge Level Indicator, Single Cell Monitoring, Overload Protection): Amazon.co.uk: DIY
RYOBI 36V 5.0Ah 5.0 Ah 5Ah Hi-Tech Lithium Ion Battery Cordless BPL3650D2 NEW | eBay