Rechargable NiMh Battery & Charger?
- Thread starter HailStonE
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blr_p
Oracle
There's a fair bit of controversy and not enough facts about those statements.
I used a charger many yrs back that did the job in 2hrs.
The problem with chargers i see here are 16-24hr which is a crazy amt of time to wait, upto 5hrs charging time is fine but longer than that is too much.
so i picked up a 6hr charger, says GP and the bateries that came with it never charge up
How long are NimH batteries supposed to last anyway ?
My guess is upto 200 cycles with full discharge, depending on your use that could be anywhere from 6 months to 2 yrs.
Is that a reasonable lifetime to expect ?
I used a charger many yrs back that did the job in 2hrs.
The problem with chargers i see here are 16-24hr which is a crazy amt of time to wait, upto 5hrs charging time is fine but longer than that is too much.
so i picked up a 6hr charger, says GP and the bateries that came with it never charge up
How long are NimH batteries supposed to last anyway ?
My guess is upto 200 cycles with full discharge, depending on your use that could be anywhere from 6 months to 2 yrs.
Is that a reasonable lifetime to expect ?
techie_007
Galvanizer
HailStonE
Forerunner
techie_007 said:
I understand sirjee..... Just mentioning whats written in the User Manual..... I too love to use eneloop but the capacity is still low... that's why I want at least 2500mAh or above....
If eneloops come in larger capacity in future I would definitely get them as well.... but right now it will not serve the purpose....
Hey thanks Hailstone. I looked up some other low self discharge types including Sony's cycle energy(blue)...basically same technology as the eneloops...any takers for the Sony ones? Anyone tried them...good/bad?
Just wondering if these 1.2V NiMh batts (2100mah) are any good for applications requiring "1.5V 2AA batteries". Simply put, Are these NiMh rechargables any good for applications like battery operated shavers, walkman,mini-portable CD player etc, or just digicams only? The previous posts do mention something about 2100mah eneloops being ok for 2300mah digicams, not much about the lower volts.
Thanks
Just wondering if these 1.2V NiMh batts (2100mah) are any good for applications requiring "1.5V 2AA batteries". Simply put, Are these NiMh rechargables any good for applications like battery operated shavers, walkman,mini-portable CD player etc, or just digicams only? The previous posts do mention something about 2100mah eneloops being ok for 2300mah digicams, not much about the lower volts.
Thanks
Surve.p said:
You opened a 1 year old thread with your earlier post.
You are technically right in posing the question about the lower terminal voltage of the NiMH chemistry. I had this question a few years ago about many gadgets that were rated with AA Alkaline usage, which as you know, is a 1.5 V chemistry.
Sadly my experience has been that the call centre agents are almost universally ignorant about this and can only quote from the sales literature or manual. On the other hand, the good thing is that I have yet to come across any gadget that was specified for use with Alkalines and has failed to work with NiMH.
I assume that the reason for this is the difference in the discharge curve of the chemistries of the primary call v/s the secondary cell. Most primary cell chemistries like manganese or lead etc have a discharge curve with a gradient that takes it down to 1 volt over its useful life. On the other hand, secondary cells have a somewhat flat discharge curve over their useful charge life and the voltage starts to drop off rapidly near the end of their charge life. That is why, a gadget designed for use with 1.5V cells will need to work till the cell voltage is down to 1 V or thereabouts and so the 1.2 V NiCd and NiMH have no problems handling this.
BTW when I went through this thread I found some sweeping statements have been made that are completely false.
thanks for the reply Emil.
Understand the difference between the discharge curvesd that the Nimh have a flatter curve, holding 1.2V thereabouts for a longer duration. Your reply concerning the fact that you've used Nimh batts for most gadgets was helpful.thanks mate
Understand the difference between the discharge curvesd that the Nimh have a flatter curve, holding 1.2V thereabouts for a longer duration. Your reply concerning the fact that you've used Nimh batts for most gadgets was helpful.thanks mate
any examples ? keen to know before 'finding-out' for myself!
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