🚀 go-pugleaf

In article <1992Oct15.022711.26392@cube.handheld.com> jmd@cube.handheld.com (Jim De Arras) writes:
>In article <dillon.0pa7@overload.Berkeley.CA.US> dillon@overload.Berkeley.CA.US
>(Matthew Dillon) writes:
>>
>>     Believe it or not people use trickle charge circuits all the time to
>>     extend the life of lithium batteries in backup situations.	This is
>>     usually necessary only when the battery would discharge due to current
>>     requirements long before it's normal shelf life expires.  With a proper
>>     charging circuit you can extend the lithium batteries backup
>>     capabilities all the way to its shelf life limit (5yr or 10yr usu).  In
>>     applications where the shelf life would expire before the nominal mAH
>>     of the battery is used up such a circuit is not required.
>>
>WRONG.  Please checkout my domain name.   Hand Held Products, Inc.  I have been
>designing battery powered devices for over 10 years, now.  Every FedEx courier

    For the record, we don't use lithium batteries at all over here... we
    use 5.5V 0.22 Farad dime capacitors for our backup requirements and
    led-acid gel cells as a primary power source.  For a portable
    application, led-acid gel cells are great because you can easily charge
    them off the vehicle's battery and don't have to worry too much about
    limiting charging current or other nasties (i.e. if you are close to
    the battery's nominal voltage you do not have to worry about
    overcharging).  There is really no need at all to use lithium or other
    expensive batteries.  We use flash rom for configuration / program
    storage so the dime cap need only backup the real time clock chip.

					    -Matt

>Jim De Arras
>VP., R&D
>Hand Held Products, Inc.
>jmd@cube.handheld.com
>WA4ONG@wa4ong.ampr.org

--

    Matthew Dillon		dillon@Overload.Berkeley.CA.US
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