Well, I've bought 10 NiMH batteries plus a "smart" charger. It certainly
heated them up when charging even though it was "Smart". I had left the
cover down, but will leave the cover up next time if I have to use it.
Does (below melting point!!) heating = damage I wonder? Anyone seen a graph
on this subject (temperature versus efficiency)?
I am going to try recharging via the 12V cigarette lighter power connection
of the A22 (it bypasses the battery pack but must give some reverse charging
at the same time) whilst monitoring the heat of the battery pack. The bloke
in Jaycar said that NiMH give a peak positive when fully charged and Ni-Cad
a negative dip when fully charged which is why Ni-Cad chargers can cook
NiMH.
PeterS
----- Original Message -----
From: "Terry Neumann" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Friday, March 09, 2001 10:20 AM
Subject: Re: [aus-soaring] Lithium ION Rechargable batteries
>
> Peter Stephenson wrote:
>
> > Are Lithium ION rechargeable batteries the way to go these days? I need
10
> > AA size batteries for my radio-transceiver (ICOM A22).
> >
> > PeterS
>
> I'm in a similar position to Peter on this one. I find myself with the
need to
> replace the cells in the pack on my aged IC A-20. I'll probably be
guided by
> the company who usually manufactures/assembles my replacement cell packs,
but
> in general I'm inclined to stay with NiCads for the present. As already
> stated, lithium ion batteries are not quite up to this degree of user
> friendliness just yet.
>
> One point which I've read somewhere long ago, but haven't been able to
> rediscover, was that it was suggested that NiMh cells will self discharge
at
> the rate of about 1% per day in normal storage. Has anyone else any
similar
> information, or was this just an ill founded rumour? Are NiCads any
better in
> this respect anyway?
>
> There does seem to be a school of thought which holds that in most
instances
> the charging regimes for NiMh and NiCad cells are similar - but NiMh types
are
> more easily offended if overcharged; indeed potentially dangerous if
> seriously overcharged and the symptoms (overheating) are ignored or not
> noticed.
>
> Most modern off-the-shelf chargers seem to be able to manage both, but
older
> ni-cad chargers, especially those with a fast charge facility, should be
viewed
> with suspicion if used with NiMh replacements. Care is needed.
>
> Any further comments welcome.
>
> Regards,
> Terry
>
>
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