🚀 go-pugleaf

Gary Hunter <garyphunter@yahoo.com> wrote:
>"Michael Pronay" <pronay@teleweb.at> wrote:
>
>>Stacy schrieb 
>>
>>>Is it better to charge batteries when they are 
>>>completely flat, as opposed to when they still 
>>>have some power?
>>
>>Complete cycles are always better. I normally 
>>leave the battery on the phone until in switches
>>off.
>>
>>>And if so..do the rapid chargers (those that are 
>>>for the GH688) discharge the battery (if it has 
>>>power left in it), before they actually charge them
>>>fully?
>>
>>No, they don't. Only desktop chargerds do that
>>in the rear battery slot.
>>
>>>Also..I have heard something about putting batteries 
>>>in the freezer to rejuvenate them...anyone know 
>>>anything about this?
>>
>>Sorry, never heard about that. The only hint to
>>the fridge that has crossed my way was to put 
>>charged batteries into them (but not in the
>>freezer compartment) where they keep the charge
>>longer than at room temperature.


>My understanding re battery care is that it depends on the technology
>1. NICAD battteries need to be fully discharged frequently and if
>possible always.
>2. NIMH batteries were supposed to fix that problem but don't.  They
>need to be fully discharged but not every time  ie fully discharge
>them every couple of weeks
>
>BUT
>
>Lithium Ion batteries as used in [hones like the Nokia 6110 etc  DO
>NOT LIKE TO BE FULLY DISCHARGED.  For maximum life with LhI batteries,
>charge them frequently and avoid fully discharging them if possible.
>I am not an expert on battery technology.  Perhaps someone who really
>is could confirm this. 
>

Go to cadex and have a read of their "batteries in a portable world" web
pages (http://www.cadex.com/cfm/index.cfm?Pg=52&Lp=55&Db=&Mo=).
Actually, I should do this myself, just in case they've updated the
info, which use to available as a Word document. But basically, it does
depend upon the battery technology. 

NiCd like to be "exercised" every month or so, NiMH every 3 months or
so, and Li usually prefer to stay about 70-90% charged, but this is
still an evolving technology.

The other thing to note about properly maintained batteries is that NiCd
can get about 1000-2000 charge/discharge cycles, NiMh about 500, and Li
about 500-1000 cycles.  The problem with NiCd's though is that the
maintainence of them is quite high, and because of the monthly
exercises, any cell mismatch (within battery packs) becomes exaggerated,
with some cells being exposed to cell reversals, if not maintained
properly.

Li batteries seem to be a very good compromise, but the "electronics"
needed monitor the battery is quite a consideration in the the cost of a
replacement. It should get better and cheaper though.
  __   __  ________________________________________________________
 //)) //))| Richard RUDEK. MicroDek. Chatswood, Sydney. Australia. |
//\\ //\\ |http://microdek.homepage.com/                           |
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