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An ampere-hour or amp-hour (symbol: A⋅h or A h; often simplified as Ah) is a unit of electric charge, having dimensions of electric current multiplied by time, equal to the charge transferred by a steady current of one ampere flowing for one hour, or 3,600 coulombs. [1] [2]
Rechargeable Commercialized Voltage Energy density Specific power Cost † Discharge efficiency Self-discharge rate Shelf life Anode Electrolyte Cathode Cutoff Nominal 100% SOC by mass by volume; year V V V MJ/kg (Wh/kg) MJ/L (Wh/L) W/kg Wh/$ ($/kWh) % %/month years Lead–acid: SLA VRLA PbAc Lead: H 2 SO 4: Lead dioxide: Yes 1881 [1 ...
Shorter Li-ion cell with a step-down converter to 1.5 V, e.g. Kentli 2,800 mAh. [180] Non-rechargeable LS14500 primary cell (SAFT: 2,600 mAh, 3.6 V) [181] 14650 [182] 940–1,200 [183] 14: 65 Approximately 5 ⁄ 4 the length of a AA cell. 15270 [184] RCR2 450–600 15: 27 Substitute for CR2 primary lithium. Nominal voltage usually is 3 V. 16340 ...
In the past, lithium-ion batteries could not be fast-charged and needed at least two hours to fully charge. Current-generation cells can be fully charged in 45 minutes or less. In 2015 researchers demonstrated a small 600 mAh capacity battery charged to 68 percent capacity in two minutes and a 3,000 mAh battery charged to 48 percent capacity in ...
This page was last edited on 1 April 2020, at 21:36 (UTC).; Text is available under the Creative Commons Attribution-ShareAlike 4.0 License; additional terms may ...
The watt, kilogram, joule, and the second are part of the International System of Units (SI). The hour is not, though it is accepted for use with the SI.Since a watt equals one joule per second and because one hour equals 3600 seconds, one watt-hour per kilogram can be expressed in SI units as 3600 joules per kilogram.
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The capacity of an alkaline battery is strongly dependent on the load. An AA-sized alkaline battery might have an effective capacity of 3000 mAh at low drain, but at a load of 1 ampere, which is common for digital cameras, the capacity could be as little as 700 mAh. [12]