Designed for today's electronic devices, Sony 2000mAh rechargeable batteries last up to three times longer than standard alkaline batteries. Pre-charged and ready to use right out of the package, these economical, environmentally-friendly Nickel-Metal Hydride (NiMH) batteries can be recharged up to 1,000 times. Additionally, each battery maintains 75% of the charge after one year and features an automatic charge cut-off timer.