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battery size?


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You can ride the battery to totally empty and then charge it with using something like the Charge Doctor between the wheel and the charger:  http://forum.electricunicycle.org/topic/346-charge-doctor/  That way you can measure the amount of mAh / Wh the battery can take in reality while charging it.

Another way is to open up the battery pack and check the cell markings, then find the capacity- and other info of the brand and model from online and calculate from there. But this is not that sure way, as there are sometimes low quality pirate-copies of big brand cells and some less-know brands make claims of 4000+mAh -cells, which actually hold maybe half of that. 

Here's a good article to understand how series- and parallel-connections affect the total capacity: http://batteryuniversity.com/learn/article/serial_and_parallel_battery_configurations


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