Amazon Basics AA High Capacity Rechargeable Batteries, NiMh, Pre charged 4 Pack (Appearance may vary)

AA high-capacity rechargeable battery (4-pack, 2400 mAh); ideal for professional or everyday use Long battery life; gradual self-discharge maintains 70% capacity for 6 months and 50% capacity for 12 months Comes pre-charged and ready to use; can be fully recharged, back up to 100% capacity, even after 3 years; can be recharged hundreds of times with minimal power or capacity loss Same product, new look! Appearance of batteries you receive may vary. NOTE: To avoid damage or undesired rapid discharge of the batteries, DO NOT MIX: non-rechargeable with rechargeable batteries; fully-charged with mid- to low-charged batteries; new with old batteries; different mAh capacities; different brands. Ni-MH Battery Tips: Verify device compatibility with 1.2V Ni-MH batteries. Runtime may be shorter than 1.5V alkaline batteries. Check proper fit as Ni-MH batteries are slightly larger than alkaline batteries to comply with IEC standards. Replace all batteries simultaneously and consult the device manual for specific requirements. Charger Tips: Use only Ni-MH specific chargers with independent charging channels and voltage monitoring to prevent overcharging or undercharging. Avoid timer-only chargers and never use chargers designed for other battery types (like NiZn or Li-ion), as this may cause damage or leakage.