Vertex FNB-V134LI High-Capacity Battery for use with VX-450, VX-260, and eVerge Series
is a High-Capacity 7.4 Volt 2300 mAh 15.5-Hour Li-ion Battery Pack.
This battery comes standard with e-Verge Series two way radios that are
using the VAC-UNI-B charger. It will also work with the TWC6ML-UNI multi-unit charger and the VAC-6058B multi-unit charger. This battery pack works with Vertex Standard UHF and VHF Two Way Radio Models:
VX-451U, VX-451V, VX-454U, VX-454V, VX-459U, EVX-531U, EVX-531V, EVX-534U, EVX-534V, EVX-539U, VX-261U, VX-261V, VX-264U, and VX-264V
Lithium Ion offers the best power-to-weight ratio, no memory effect, and has slow loss of charge when not in use.