Tenergy 250mAh NiMH 9V household batteries has 8 premium rechargeable batteries. An ideal replacement on any standard 9V size batteries or disposable everyday 9V alkaline batteries for smoke detectors/alarms, digital cameras, toys, TENS unit, guitar pedal/pickup, walkie-talkies, medical devices and much more electronic devices. Dimensions of our standard size 9V rectangular battery is 48x26x16mm (H x L x W). Power your outdoor devices all year long in any season. Tenergy 9V batteries deliver optimal performance in the winter when temperatures are as low as 14°F (-10°C) or in the summer when it's as high as 122°F (50°C). Recharge the premium 9V cells with an incredible cycle life up to 1000 times. This 9V smart charger for rechargeable 9V battery has a built-in shut-off timer (5 hours) protecting the batteries from overcharging. Trickle charging will occur when complete to ensure the 9V NiMH battery stay fully charged. Managed by a Microprocessor Control Unit (MCU), each individual bay has integrated circuit and polarity protection with - delta V detection. The charger has four independent charging channels with independent LED lights to show when each volt 9 battery is charging or complete. Worldwide voltage 100V ~ 240VAC 4-slot charger allows you to use these everyday 9V batteries anywhere. Both the 9V batteries and NiMH 9V charger include 12-month warranty. Tenergy TN136 charger is compatible with nickle-meal hydride 9 volt batteries. This bundle includes the charger and 8 pack of Tenergy's Premium 9 volt batteries. Tenergy's Premium 9V batteries have 250mAh capacity and can be recharged 1,200 times. Switch over to rechargeable 9 volt batteries and discover the savings they provide over the long term compared to single use 9v batteries. These 9 volt batteries are standard size and measure 48x26x16mm and are compatible with common electronics such as smoke detectors/alarms, digital cameras, toys, TENS unit, guitar pedal/pickup, walkie-talkies, medical devices, and much more. Tenergy's charger and batteries include 12 months warranty and lifetime support from our team in based in California.