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Old 10-01-2001, 09:09 PM   #1
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Default How to revive 3000nimh ??

My Sanyo 3000 went to early retirement after taking 4 weeks vacation !!! The capacity is 2200mAh at 20A discharge. I didnt leave it partially charge and now ........ sob sob

Is there anyway to revive them? I've tired cycling numerous times at different charge rates 3~4.5A but still no avail.

Heeeelpppp ...........
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Old 10-01-2001, 10:02 PM   #2
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Default No idea but...

do you guys think Zapping 'em will help? My own sanyo 3k cells are also decreasing in capacity! Actually when I bought 'em my charger charges them to only about 2.6k, now it's dropping to 2.5k.

OTOH, my GP 3k NiMHs are going strong, same maintenance as my Sanyo 3ks (Discharge to 5.4 etc.etc.) but the Sanyo's don't keep the charge as well. Maybe it's because I charge the sanyos @ 5A (according to the battery specs). Both delta peak @ 3mv.

I probably will be getting more GP cells, they seem to provide the best bang for teh buck

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Old 10-01-2001, 10:19 PM   #3
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My ones are charging up to about 26-2700Mah(@4amps/30mv rollback) and discharging about the same according to my Orion Digital discharger(To [email protected])
I've only had my Spacecharger for a month or so, I had an LRP previously which didn't have a digital readout. I did charge a brand new pack belonging to a friend last week and that went up to 2880Mah.
As far as I know, there's not a lot we can do.
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Old 10-01-2001, 11:31 PM   #4
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humm...i dont have any problem with the 3000mah batt...i have panasonics ones and had them for a long time....it always charge up to 2990-3xxx mah with the millennium
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Old 10-01-2001, 11:38 PM   #5
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My experience tells me that whenever the pack has been unused for a period of time (>1week) the first discharge looks really bad. On the second discharge the Voltage comes up by 0.1V average and the runtime by 20-30s. This goes only for NiMh.
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Old 10-02-2001, 12:28 AM   #6
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my 8 month old orion sanyo 3000s not only lost runtime but also voltage. ive been charging them at 4amps, .03v cutoff. then discharge at 20 amps. i store them after a 20 minute charge. i think i didnt use them for two weeks then when i began to use them again, they started deteriorating. well, i guess, theyll become my practice cells. or maybe add another cell for faster practice runs.

i got new unmatched sanyo 3000s and ill just cycle them every week. ive had them for 2 months and voltage and runtimes are still holding.
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Old 10-02-2001, 12:47 AM   #7
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One of the packs I'm using is from GP, these IMHO are pretty good for unmatched packs.



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Old 10-02-2001, 02:14 AM   #8
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Thanks for all the feedback guys. I guess the chemical inside deteriotes after ~10days of non-active state for Nimh - true/false. That tells me I'll have to treat these cells differently from nicads, by exercising them once a week - if i were to get new cells later.
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Old 10-02-2001, 04:36 AM   #9
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RC car racers will never be able to go on holiday again !!!

There will have to be NimH minding services like for pets !!!
LOL
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Old 10-02-2001, 05:22 AM   #10
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i read somewhere that heating them up either by oven (not the microwave kind) or by sunning can help revive "dead" batts. the theory is to melt the crystals that formed when it was left for several weeks.

i read this somewhere on the net.

try sunning them first until they get hot. once they're cool try charging them.

btw, what's your charger?
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Old 10-02-2001, 05:27 AM   #11
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and if its cloudy or really cold where you live...try using a hair dryer!!
hehe!!
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Old 10-02-2001, 06:05 AM   #12
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heh, that's amusing.

OTOH, this is what I notice about my battery packs.

My GP cells upon charging, start from around 8.2v and peak at around 9.4 volts.

The Sanyo 3k cells OTOH start from around 8.4 volts and peak too at 9.4 volts.

GP charged @ 4A, Sanyo @ 5A, wonder if t his is the difference. Oh well at least my sanyos still maintaining around 2.6k... I can live with it. I'm a stock guy

~Alvin
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Old 10-02-2001, 06:32 AM   #13
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Have you guys tried a maintenance zap on the batteries? If all else fails, why not?
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Old 10-02-2001, 03:18 PM   #14
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I have had this issue with one of my packs of Sanyos. I have 2 packs, one from a very highly respected matcher (Peak/Orion) and the other from a much smaller matcher.

The Peak's are the oldest (8-9 months), have had some periods of inactivity and still take close on 3000mAh on my CS Space charger.

The others are not as old (6 months), have had about the same periods of inactivity and are down to about 2800mAh.

The only conclusing that i can come to is that the Peak's are a closer match than the ones from the smaller matcher. This may be unfair, but i can' tthink of any other reason.
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