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Author Topic: SparkFun Li-Po Shield: What Resistor To Charge At 500mAh?  (Read 498 times)
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SparkFun Li-Po Shield: What Resistor To Charge At 500mAh?

https://www.sparkfun.com/products/10711
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peace*&^

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500 mAh is a capacity, not a charge rate.  The charge rate is in mA.  I think a "1C" rate is the current it would take to reach capacity in 1 hour.  In your case: 500 mA (0.5 A).

The schematic shows that the charge current is 1000/R and the built-in R is 10K.  This makes the default current 100 mA (0.1A).  The schematic also says that to get the maximum allowable charge current add a 2.5K resistor.  In the product description it says that the maximum allowed charge current is 500 mA (0.5 A).

So the answer is 2.5k.
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R10 - 2.5K to enable maximum charging rate
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Drew.
http://www.uk-pcb.co.uk - My UK Based PCB Fab & Assembly Company
Design work undertaken
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