Rechargeable Energizer 2500mah: Memory Effect?


Ron

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I was wondering if the rechargeable Energizer 2500mAh batteries suffer from the "memory effect" that occurs when batteries are charged before being fully depleted. If so, it may cause problems for me when I get my 2X as I charge all of my devices (phone, iPod, Pocket PC, laptop, DS) while I sleep, regardless of their current charge.
 
It depends on what kind of battery they are, evrything over 1700 is probably nimh.
Nimh dont suffer from the memory effect.
 
Vimacs posted on Sep 22 2006 at 01:12 AM said:
It depends on what kind of battery they are, evrything over 1700 is probably nimh.
Nimh dont suffer from the memory effect.

Wikipedia stated that NiMH's memory effect was less apparent than that of NiCd's, but didn't mention that it was to a point that's unnoticeable under normal use. That's good to hear.
 
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I've experienced memory effects with all of my NiMH rechargeable batteries. If you're in doubt .. discharge them fully in the GP2X, let the screen turn off, the backlight fail, etc. When it seems 100% dead, take them out and put them in a GBA or a portable CD player, something to kill them the rest of the way. Then charge to 100% and don't stop in the middle (or you'll need to start the process again) .. then use. :)
 
I have been using 2500mAh NiMHs for a long time with the GP32, GP2X, Photo Camera... and so far I have not noticed any memory effect.
I usually do not wait until the battery is fully discharged to charge it again.
What happens with time, after 1000 charge cycles or so, is that the battery basically "dies". Its operation gets severely compromised - you charge it (the charger says its fine) and the battery will last way less then it is supposed to. I have noticed that the process is not gradual - it is quite sudden. When that happens, just buy new NiMHs and take the old ones to the nearest recycling center.

In other words - buy the 2500mAh and use them around 1000 times. When they fail, dispose of them and buy new ones. It is definitely worth the money.
 
i think NiMH batteries have memory effect only when beeing over-charged

EDIT : whereas NiCd have when you recharge them, not having completely discharged them
 
Overcharging can damage NiMH batteries more easily than NiCD, but I don't think it's the same thing as memory effect. I guess the recommendations are to fully discharge NiCD at least once a month, and NiMH about 3 months. If you start noticing capacity problems, it's always a good thing to try anyway.
 
Epicenter posted on Sep 22 2006 at 02:55 PM said:
I've experienced memory effects with all of my NiMH rechargeable batteries. If you're in doubt .. discharge them fully in the GP2X, let the screen turn off, the backlight fail, etc. When it seems 100% dead, take them out and put them in a GBA or a portable CD player, something to kill them the rest of the way. Then charge to 100% and don't stop in the middle (or you'll need to start the process again) .. then use. :)
Or just get a charger who can do that. :p
 
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dgrams2000 posted on Sep 22 2006 at 04:23 PM said:
What is this "memory effect" you all are talking about?

Memory Effect is basically when you dont use all the juice in a rechargable battery it will not get the full charge the next time charged up. It is surely not the problem that it used to be. I have energizer 2500 batteries (a metric crapton of them) and they dont seem to have much of a problem..

Maybe they do and I don't notice. I think it would be best if I started marking my batteries in pairs. As it stands im not always sure if the batteries that I put in are ones recently charged or ones a few weeks back. Don't worry, I don't think you should have much of a noticable problem.
 
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All I can say is, make sure you have a very good charger. I had an energizer charger that I bought for about $30 last year. I wasn't getting very good performance from the freshly charged 2500 batteries. So I picked up another Duracell charger for about $20. Performance improved a little, but it was still fairly poor, and not consistant. Then I went spent a bundle and ordered a sony quick charger for about $40, and my batteries last 3-4X as long.
 
project86 posted on Sep 23 2006 at 02:07 AM said:
All I can say is, make sure you have a very good charger. I had an energizer charger that I bought for about $30 last year. I wasn't getting very good performance from the freshly charged 2500 batteries. So I picked up another Duracell charger for about $20. Performance improved a little, but it was still fairly poor, and not consistant. Then I went spent a bundle and ordered a sony quick charger for about $40, and my batteries last 3-4X as long.

I agree I got 1 of them UNIROSS X-Press 700 Charger it was ok for a few months then the battery life seemed to detereiate then Mplin had an offer on there own charger (with 4 2400NiMH) i hvent had any problems and the batteries seem to be restored to former health
 
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Knoxximus posted on Sep 23 2006 at 08:44 AM said:
Could someone post some links to some solid, tried and true chargers? Everytime I think I'm getting a good or better one, I'm always dissapointed. Thanks!

In another battery related thread, BradN pointed out this one to me; been drooling over it ever since... That's probably my first purchase next month when my paycheck has arrived. I'd rather have it sooner, but this month I went on a spending spree, and my expendable cash reserves are running a bit low. ;)
 
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