Re: Lithium batteries not recommended?

On Thu, 22 Sep 2005 19:17:38 -0400, Cathy wrote:

> "ASAAR" <caught@xxxxxx> wrote in message
>
> You forgot to tell me - what is a "smart" charger?

An older charger uses a timer circuit, and when it stops charging
the batteries may not be fully charged, or they may be overcharged.

A smart charger doesn't have to know what capacity battery is
being charged. It could be 450mah or 2,800mah. The usual method is
called delta-V, where delta is one of the characters (alpha, beta,
gamma, delta, epsilon, etc.) traditionally used in mathematics to
represent a small change of some property. The charger watches how
the voltage changes during charging., and when it sees the pattern
associated with a rechargeable battery that is nearly charged, it
either stops, or goes into trickle charge mode. Unfortunately, not
all smart chargers list the word "Smart" on the package. The
instructions are usually sealed inside the package and may not be
too useful even if you were able to read them in advance. What you
could do is pick a couple of manufacturers whose products you've
seen in stores, and check their websites for product information or
manuals. Then you can carry a list with you when you go shopping,
armed with the model numbers of their smart chargers. That'll help
you to avoid their cheaper timed chargers.

.

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