battery storage ( discharger) - RC Groups
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Aug 21, 2009, 11:26 AM
elcamino's Avatar

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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Aug 21, 2009, 04:48 PM
Intensely Calm
write2dgray's Avatar
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
Aug 21, 2009, 08:28 PM
Surface, Air & Water Rc Toys..
freechip's Avatar
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.
Aug 22, 2009, 02:57 PM
Registered User
Challenger 413's Avatar
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...

Aug 22, 2009, 03:10 PM
Registered User
Challenger413, did you hook the bulbs up in series or parallel?

Aug 22, 2009, 03:22 PM
Registered User
Challenger 413's Avatar

EDIT: Looks like parallel, sorry about that.

Last edited by Challenger 413; Aug 22, 2009 at 03:28 PM.
Aug 22, 2009, 03:28 PM
Registered User

Parallel would seem more reasonable.

Aug 22, 2009, 03:34 PM
Registered User
Challenger 413's Avatar
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.

Aug 22, 2009, 03:36 PM
elcamino's Avatar
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.
Aug 22, 2009, 03:44 PM
Registered User
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.

Aug 22, 2009, 04:04 PM
Space Coast USA
hoppy's Avatar
If you had charger with a discharge mode for NiMH/NiCd, you could just set it for 3.75V/cell.
Aug 22, 2009, 04:28 PM
Xpress..'s Avatar
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
Aug 22, 2009, 04:45 PM
Chesapeake Bay RC Club
Gary Hoorn's Avatar
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.
Aug 22, 2009, 05:01 PM
Registered User
ebill3's Avatar

Aug 22, 2009, 05:14 PM
Registered User
Challenger 413's Avatar
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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