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Old Aug 21, 2009, 10:26 AM
electromaniac
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pittsburgh
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battery storage ( discharger)

I have several chargers but the only one that discharges is my astro and Im looking for something to discharge my batteries for winter storage. I would like something that discharges for storage only and the only thing I can find is somthing called a power pilot from x-heli for $40 but can find no info on it here in rc groups. Anyone have any info on it or any other dischagers out there ?????
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Old Aug 21, 2009, 03:48 PM
ProgressiveRC
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CBA III is the most robust dedicated (and affordable?) discharge devices available. You may look at them if you are looking for more than the 10-30W that most devices offer.

- David
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Old Aug 21, 2009, 07:28 PM
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Quote:
Originally Posted by write2dgray
CBA III is the most robust dedicated (and affordable?) discharge devices available. - David
Don't entirely agree with that statement since using them in the actual RC itself would discharge them and it would not cost you anything. Then all you got to do is charge them to their respect storage voltage.

People get carried away I think when it comes to dischargers as they were to be used to discharge your flight pack to determine their remaining capacity to help you know how much longer you could of stayed in the air flying.
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Old Aug 22, 2009, 01:57 PM
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I use (3) #1156 12 volt tail light bulbs soldered together to discharge my packs to storage level. I use my Xtrema charger in the watt meter mode and stop when I am about .5 volts below what I want the packs to be at, because of voltage rise. I think the 2 packs of 2 bulbs each cost less than $10.00, can't remember since I bought them a couple of years ago.

Broke one bulb, so that is why I am using 3...

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Old Aug 22, 2009, 02:10 PM
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Challenger413, did you hook the bulbs up in series or parallel?

Bill
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Old Aug 22, 2009, 02:22 PM
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Series.,,,

EDIT: Looks like parallel, sorry about that.

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Last edited by Challenger 413; Aug 22, 2009 at 02:28 PM.
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Old Aug 22, 2009, 02:28 PM
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Tnx.

Parallel would seem more reasonable.

Bill
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Old Aug 22, 2009, 02:34 PM
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I use it on 3S and 4S packs. I have the AF 109 and it takes forever. With the bulbs, they are down to storage voltage in no time. Just be careful, if you forget, it will drain them too far.


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Old Aug 22, 2009, 02:36 PM
electromaniac
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After looking around on the net it seems that Ill have to use the old light bulb set up I have. I was hopeing for something more plug & play like oh well Im shure technology will catch up sooner or latter.
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Old Aug 22, 2009, 02:44 PM
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Using the bulb method you're not measuring each cell, so it seems there should be a way to design a circuit to monitor the voltage and when it reaches a fixed point it will open the circuit to the bulbs and stop the discharge.

Bill
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Old Aug 22, 2009, 03:04 PM
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If you had charger with a discharge mode for NiMH/NiCd, you could just set it for 3.75V/cell.
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Old Aug 22, 2009, 03:28 PM
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Just be sure to use a voltmeter/watt meter to measure pack voltage. Once you're down to ~3.85v per cell, you're golden for storage
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Old Aug 22, 2009, 03:45 PM
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I have to agree with what David said about the CBAIII load tester. Once you ruin a lipo because of one of your light bulb thingys stays on too long you will appreciate the CBA. I have light bulbs as well but only use them to fully discharge a lipo for disposal.
Gary
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Old Aug 22, 2009, 04:01 PM
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http://www.rcgroups.com/forums/showthread.php?t=704489

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Old Aug 22, 2009, 04:14 PM
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As long as you stay with the pack while it is discharging, how can you forget? The light are so bright, that I am always reminded.

Now if you are prone to leave the room while discharging, then you should pick another way of doing it...

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