OSTENT 460mAh 3.8V Rechargeable Lithium-ion Battery Kit Pack Compatible for Nintendo GBM Game Boy Micro Power Voltage: 3.8V, 460mAh, 100% brand new and high quality Perfectly fits your Nintendo GBM, Easy to install Long life power supply, can be charged or discharged hundred times Ideal for replacing your damaged or unused battery for Nintendo GBM The battery initially not charged, be sure to charge the battery before using it for the first time