PMNN4434AR battery replacement works with RM Series Radios. Compatible with RMU2040 RMU2080 RMU2080d RMM2050 and RMV2080. ^^ Rechargeable Lithium Ion Battery has a 2200 mAh capacity. ^^ IFREQTECH 3.7 v 2200mAh Li-ion PMNN4434AR battery Replacement for PMNN4434 PMNN4453 PMNN4434A PMNN4434AR battery. ^^ Safety protectionOver-charge, over-discharge, over-heat, over-current and short-circuit protection. ^^ Please be sure to use the battery charger or charging interphone standard of corresponding battery charging. 12 Hours chargering is recommended for the first time.