The FNB-V87Li is a 7.4 volt 2600mAh rechargeable Li-ION battery for Vertex & Yaesu radios such as VX-820, VX-821, VX-824, VX-829, VX-920, VX-921, VX-924, VX-929, VX-900, VX-600, VX-870, etc.  This is an Ultra long life battery. Re-charges in stock OEM Charging systems. Replaces FNB-V86, FNB-V86Li, FNB-V87, FNB-V87Li, FNB-V92, FNB-V92Li.