WESCO 4.0AH 18V battery ONLY COMPATIBLE WITH WS9928 WS9940 £42.99 - PicClick UK
Badger 20-Volt Max 4 Ah Rechargeable Lithium Ion (Li-ion) Cordless Power Equipment Battery in the Cordless Power Equipment Batteries & Chargers department at Lowes.com
ERI621BAT 18V 2.0Ah Li Ion Battery18 Volt 2 Amps Rechargeable Lithium Battery for Erbauer or WORX power tool|battery pack lithium|lithium battery cell phonelithium batteries memory - AliExpress
Stacyc Stability Cycle 20v Max 5.0ah Removable Battery - Motorcycle, ATV / UTV & Powersports Parts | The Best Powersports, Motorcycle, ATV & Snow Gear, Accessories and More