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Old Apr 12, 2012, 07:07 PM
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Lipos to storage voltage?


hey guys. if i have a fully charged lipo that i wasn't able to use, how would i go about to discharge it down to storage voltage?
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Old Apr 12, 2012, 07:10 PM
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Easiest and cheapest way...

Plug it into a discharged lipoly of same cell count and limit current flow with a power resistor like this.

Another very effective and foolproof way is to use an automotive lightbulb in conjunction with this cutoff circuit.

Mark
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Old Apr 12, 2012, 07:15 PM
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cool thanks. my charger has a discharge setting; could i use that to get it down to the right voltage?
Old Apr 12, 2012, 07:19 PM
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Yes, you can. However, lipo cutoff voltage on most chargers is WAY too low and can damage your lipoly. You can use NiMH discharge and set cutoff to ~3.8V/cell and it should get you in perfect storage range.

Some chargers have Lipo storage setting that will discharge and cutoff at appropriate voltage.

Note that most inexpensive chargers have extremely limited discharge capability and will take a VERY long time to reach storage voltage on a large pack. Also, there have been many reports of burned up chargers as a result of using a charger to discharge lipolys. It's for this reason that I never recommend using an expensive charger to discharge packs. It's much cheaper to replace a lightbulb than an entire charger...

Mark
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Old Apr 12, 2012, 07:35 PM
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Quote:
Originally Posted by mrforsyth View Post
Yes, you can. However, lipo cutoff voltage on most chargers is WAY too low and can damage your lipoly. You can use NiMH discharge and set cutoff to ~3.8V/cell and it should get you in perfect storage range.

Some chargers have Lipo storage setting that will discharge and cutoff at appropriate voltage.

Note that most inexpensive chargers have extremely limited discharge capability and will take a VERY long time to reach storage voltage on a large pack. Also, there have been many reports of burned up chargers as a result of using a charger to discharge lipolys. It's for this reason that I never recommend using an expensive charger to discharge packs. It's much cheaper to replace a lightbulb than an entire charger...

Mark
okay cool thanks.
Old Apr 13, 2012, 03:28 PM
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just a question; how do you discharge a lipo using a lightbulb?
Old Apr 13, 2012, 03:31 PM
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There's a simple circuit that was linked in post #2 above that is fun to build and works wonderfully. It uses cheap 12V automotive lightbulbs.

Here it is again: https://www.rcgroups.com/forums/show....php?t=1131817

Mark
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Old Apr 13, 2012, 06:31 PM
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oh okay thanks.


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