Blu Adanvance 4.5 A310 C645004170T Aksberry(R) 1700mAh High Capacity Li-ion Mobile Phone Battery Compatible Model: Blu Adanvance 4.5 A310 C645004170T Brand new and high quality battery. Integrated microchip inside prevents overcharging and lengthens battery life. Use the authorized charger only. If you don't use the battery for a long time, please put it in a dry and cool place and make it full charged once every three months.