Re: Lithium-Ion RCR-V3 Batteries?
From: budgie (me_at_privacy.net)
Date: 02/16/05
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Date: Wed, 16 Feb 2005 13:09:44 +0800
On Wed, 16 Feb 2005 01:17:56 GMT, "Searching_ut"
<Searching_ut-nospam-@sprynet.com> wrote:
>For the most part, I too prefer the NiMh. However, In an environment like a
>laptop computer where you can expect the battery to be subjected to fairly
>high temperatures for long periods of time, I prefer NiCd batteries because
>they tend to be considerably less sensitive to heat over time.
I guess that depends on how you operate your laptop. I don't operate for any
extended period with the pack in the machine. I've still got a pack dated 1996
that gives 2/3 of its original duration. Certainly heat in the battery bay is
an unavoidable health hazard to any type of cell.
>As for the cell imbalance problems, that does tend to be a problem with pack
>type batteries, be it lithium or Nickel you're using in your laptop.
More so with NiXX than Li-XX simply because of the cell count being three times
as high.
>That
>said, the problem generally can be minimized or eliminated by using battery
>conditioners once a month or so that discharge the pack down, then re-charge
>using a slow (1/10c or slower) trickle charge rather than a peak detection
>method. (cell balance is more complicated with lithiums).
That's applicable to nickel but not really to Lithium types.
>I would think it
>easier and cheaper for laptop manufactures to build in circuits to keep NiMh
>or Nicad packs conditioned than it is to build the charging/monitoring
>circuits to prevent cell imbalance, over/under charge/discharge etc
>necessary with Lithiums.
The pack protection modules are small cheap assemblies sourced from (usually)
thrid world manufacturers for peanuts, and stuffed in the pack. The manufaturer
hardly notices them in $ terms. In fact they are not placed in the machine
itself simply because they are mortal.
>For the cell phones, and other devices that only
>need 3 volts or so, the problem would however be completely eliminated,
>which is a very good point.
(snip testing)
In many applications Lithium offers no dramatic power density advantage. It's
main benefits come from lighter weight (eg in EV's) and the ability to have
prismatic packs that better fill available space in small appliances such as MP3
players and cellphones.
I'll probably attract a heap of flaming over that first bit ;-)
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