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Re: [DTXpress] Re: Memory loss

2007-02-08 by Corey Dixon

From a chemical standpoint, leaving the module on all the time would more than likely shorten the overall life of the battery, as opposed to enhance it. Lithium ion batteries are "designed" to be worked on regular basis, even though the suffer no memory effect. Assuming the CPU is designed similiar to that of your typical PC motherboards, the battery is not drawn from unless AC power to the memory board is lost. Even still, with standard exercise, a typical lithium battery of the mentioned size should only last about 5 years, since they typically lose about 15-20% capacity per year. As long as your warranty is expired, it wouldn't hurt to open up the module and replace the cell every 5 years or so.

Keith wrote:
--- In DTXpress@yahoogroups.com, "emf" ...> wrote:
> Keith,
>
> I wonder whether it would be better for battery life to keep the
> module running all the time.
>
> Ed
>

Ed,

Without taking mine apart and measuring the leakage current it is
difficult to say. Often the current taken to hold up the memory by a
backup battery is no more than the self discharge of the battery
itself, although the discharge will always be slower while the power
is on. Temperature makes a huge difference to leakage currents, so a
module kept in a hot climate will discharge quicker.

Maybe it's time to backup my kits!

Keith.


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