Amazon.com: Replacement for Olympus VX-402 Battery - Fully Compatible with PV-610, BA32-1, VCC-516, VCC-526, VCC-550 - (1800mAh Ni-MH) : Electronics
Powering DS1339 RTC Battery and VCC from Same Source : r/AskElectronics
Motorola PMNN4468 Lithium Ion Rechargeable Battery for SL, EVX and TKL Series Radios - Keep an extra battery pack around for emergencies. Free Shipping.