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Old Dec 09, 2009, 07:23 PM
What's 3D?
trumps's Avatar
Australia, WA, Ellenbrook
Joined Feb 2008
3,318 Posts
Question
Battery discharger tool for storage

Hi all,
i work away on a 2/1 week roster and am looking for a discharge unit that can accurately discharge my batteries down to a storage voltage in a reasonable time frame. i have a unit from hobbycity that discharges at i think
1amp, it works well but when there are 10-20 batteries to be discharged it takes far to long to do at such a low discharge rate. i understand why the rate is so low as disapating the heat is a big issue but if i can fly out a 2200mah pack in 10 minutes surely there is a way that a dicharger can drive a resistor, heatsink and fan to achieve much the same sort of rate, and also have a preset cell cutoff voltage 3.8V for storage. even if it took say 15 minutes that by my calculations should be about 9-10Amps which would be safely achievable i would have thought!
any ideas on this, or knowlege of an existing unit would be appreciated, i an no electrical guru, but i might have to try and nut someting out, learn as i go!

Cheers
Craig
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Old Dec 09, 2009, 11:11 PM
Is my CG correct?
discostu956's Avatar
Wollongong, Aus
Joined Sep 2009
5,096 Posts
There was something like this in the DIY electronic forum. Have a search through there.
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Old Dec 09, 2009, 11:26 PM
What's 3D?
trumps's Avatar
Australia, WA, Ellenbrook
Joined Feb 2008
3,318 Posts
Cheers bud,
found it, looks like just the ticket.
here is the link for anyone interested.
http://www.rcgroups.com/forums/showthread.php?t=1131817

Craig
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Old Dec 09, 2009, 11:34 PM
PLD
Magicsmoke maker
PLD's Avatar
Australia, QLD, Charters Towers
Joined Dec 2003
17,404 Posts
buy 10 of these

http://nqrc.com/?vp=PLD-LN3S-01

Also, the reason for the reluctance to discharge in 10 minutes is that it's easy to overshoot and yes, getting rid of a few hundred watts of heat is never easy/safe/cheap.

Paul.
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Old Dec 10, 2009, 01:42 AM
Is my CG correct?
discostu956's Avatar
Wollongong, Aus
Joined Sep 2009
5,096 Posts
Quote:
Cheers bud,
found it, looks like just the ticket.
here is the link for anyone interested.
http://www.rcgroups.com/forums/showthread.php?t=1131817

Craig
Cool, I would have linked to it but didn't have time to find it. Good luck with it
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Old Dec 10, 2009, 04:10 AM
Next time I'll ARTF...
glydr's Avatar
Canberra, Australia (Southside)
Joined Feb 2004
4,634 Posts
Quote:
Originally Posted by pldaniels View Post
That's what I use.

Quote:
Originally Posted by pldaniels View Post

Also, the reason for the reluctance to discharge in 10 minutes is that it's easy to overshoot and yes, getting rid of a few hundred watts of heat is never easy/safe/cheap.
Also - a slow discharge is better for the battery. Compare how heli packs (worked hard) wear out sooner compared to slow parkfly lipos.
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Old Dec 10, 2009, 08:17 AM
Outta Sight
Australia, WA, Joondalup
Joined Jul 2008
937 Posts
The iCharger 1010B+ can discharge through a resistor at up to 300w.
I use it to bring my 10S packs down to storage voltage when I'm not using them and it does it at around 7 amps.
They also have heaps of other functions.
Hobbycity carries them, not exactly cheap, but if you're on 2/1 then money aint a big problem right?
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Old Dec 10, 2009, 08:54 AM
What's 3D?
trumps's Avatar
Australia, WA, Ellenbrook
Joined Feb 2008
3,318 Posts
LOL Roland, it's a relative thing mate, we live according to our means!
cheers for the tip on the charger, i have been thinking about upgrading
as my old swallow2 is getting one hell of a workout these days charging
20 odd batteries for a club day, i have to start charging 2 days ahead!
poor little bugga can't last for ever!

Cheers
Craig
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Old Dec 10, 2009, 05:03 PM
Outta Sight
Australia, WA, Joondalup
Joined Jul 2008
937 Posts
I know how it goes Craig, I lived and worked in Karratha for a while, earnt heaps and spent it on "living" expenses.

I use 2 iCharger1010B+ chargers for charging my 10S 5AH Lipo packs, these chargers are great for high rate charging.

If i want to charge lots of smaller Lipos (2S and 3S) at the same time I use one of these quattro chargers.
http://www.hobbycity.com/hobbycity/s...Multi_Charger_

They have better specs than the Swallow and there's 4 of them that can charge, or cycle or store etc all at the same time.
And for AU$150 delivered you cant go wrong.
Cheers,
Rol.
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