charging batteries

charging batteries

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26 January 2015 at 17:15 #55454
Roy Carson
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@roycarson30714
I know there a formula to work out how long a battery should be charged,, to be fully charged but I cannot remember it. Can some nice person who knows this formula tell what it is. I have a charger with an output of 120 ma.

Many thanks Roy
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26 January 2015 at 17:15 #2463
Roy Carson
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@roycarson30714
27 January 2015 at 10:29 #55480
Dave Milbourn
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@davemilbourn48782
From fully discharged you should charge the battery for the battery capacity/charging rate x 1.4. So if your battery pack is 2400mAH then the calculation is 2400/120 x 1.4 = 28 hours.
This applies to NiCAD and NiMHbatteries; LiPo packs need a special charger which monitors how much charge goes into each cell (aka a balanced charger). Some chargers will automatically monitor the battery and switch off the charge at the point where the temperature peaks (fully charged).
You should always read the instructions for the charger before using it for the first time – don't assume they are all the same!
Dave M
28 January 2015 at 09:33 #55520
Roy Carson
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@roycarson30714
Hi Dave, many thanks, i did remember the first part but not the final bit. thanks again Roy
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