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Member #42288

Member Since: June 26, 2008

Country: United States

  • Lots of confusion here. It's like kWh that your electric company charges you for power. They can't measure Watts only because it varies over time. A 100W light bulb consumes 100W. But how much power will it use in an hour? 100Wh. Or, 0.1kWh. Ten 100W bulbs will consume 1kWh in one hour, etc.

    Batteries have a certain amount of charge they can hold...measured in mAh...milliamp-hours. 850mAh means the battery can supply 850mA for one hour...or 425mA for two hours...or 1mA for 850 hours. Of course, this is not an exact science and you may be able to get more or less power out of a particular battery depending on exactly how fast you discharge it.

    This honestly has nothing to do with how long it takes to charge the battery. And, of course, there are limits to how fast you can discharge the battery as well. All the Lipo batteries I'm aware of and certainly all of those sold at Sparkfun have overcurrent protection which limits the rate at which they can be discharged. You may even want to consider limits beyond those imposed. The wires and connectors are quite small and won't be able to carry much current without overheating and melting.

    Best of luck, all!

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