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2. Battery grip - Wikipedia

   en.wikipedia.org/wiki/Battery_grip

   Sony Alpha 700 with battery grip N50. A battery grip is an accessory for an SLR/DSLR (and occasionally other cameras), which allows the camera to hold multiple batteries to extend the battery life of the camera, and adds a vertical grip with an extra shutter release (and other controls), facilitating the shooting of portrait photography. [1]

3. Canon BG-ED3 - Wikipedia

   en.wikipedia.org/wiki/Canon_BG-ED3

   The Canon BG-ED3 is a battery grip manufactured by Canon for certain models of its EOS digital SLR camera range. It was originally designed for the Canon EOS D30 . [ 1 ] It can hold 2 BP-511 or BP-511A batteries, effectively doubling the battery life of these cameras. [ 2 ]

4. Battery holder - Wikipedia

   en.wikipedia.org/wiki/Battery_holder

   Battery types such as the 9-volt have snap-on contacts. Battery holders for zinc-air batteries must not be completely air-tight since approximately 1 litre of air is required per ampere-hour of discharge per cell. The battery holder may include a valve integrated with the device power switch to allow air to be admitted when the device is ...

5. List of battery sizes - Wikipedia

   en.wikipedia.org/wiki/List_of_battery_sizes

   A Battery: Eveready 742: 1.5 V: Metal tabs H: 101.6 L: 63.5 W: 63.5 Used to provide power to the filament of a vacuum tube. B Battery: Eveready 762-S: 45 V: Threa­ded posts H: 146 L: 104.8 W: 63.5 Used to supply plate voltage in vintage vacuum tube equipment. Origin of the term B+ for plate voltage power supplies.

6. Pentax K-5 - Wikipedia

   en.wikipedia.org/wiki/Pentax_K-5

   Rechargeable Li-Ion battery D-LI90 or 6 × AA (R6) batteries in battery grip D-BG4; Magnesium alloy shell over stainless steel chassis, weather resistant with 77 weather protection seals. The K-5 is designed to operate at temperatures of −10 to 40 °C (14 to 104 °F). Two-axis (roll and pitch) level meter

7. Battery balancing - Wikipedia

   en.wikipedia.org/wiki/Battery_balancing

   Battery balancing and battery redistribution refer to techniques that improve the available capacity of a battery pack with multiple cells (usually in series) and increase each cell's longevity. [1] A battery balancer or battery regulator is an electrical device in a battery pack that performs battery balancing. [ 2 ]