Compatible for xpr6100 xpr6300 xpr6350 xpr6380 xpr6500 xpr6550 xpr4380 xpr6580 xpr8300 xtr8300 nntn4077 nntn4103 pmnn4066 pmnn4066a pmnn4066b battery Package included : 4 pcs x pmnn4066/pmnn4066a/pmnn4066b battery and 4 pcs x belt clip （High Capacity 2500mAh) A new and perfect xpr6550 battery replacement for your xpr6550 radios,tested under strict QC standards to ensure it lasts over 800 charge cycles. built-in microchip to prevent overcharging, overdischarging, short-circuiting, and overheating. Great Customer Service: Please contact us anytime if there is anything we could help you with. We promise you a satisfaction resolution within 24 hours. We take care of all quality-related issues . Reminder: We kindly suggest fully draining and fully charging the xpr6550 battery, especially during the first 3 charging and discharging cycles. Doing so may greatly improve the overall life of the xpr6550 battery. for xpr6100 xpr6300 xpr6350 xpr6380 xpr6500 xpr6550 xpr4380 xpr6580 xpr8300 xtr8300 nntn4077 nntn4103 pmnn4066 pmnn4066a pmnn4066b battery