On 6 Sep 2000, at 21:02, w. v. ooijen / f. hanneman wrote:


 The nice thing is that I can now compare batteries just on a
> money-per-Watt-hour basis. Suddenly a 4 V lead-gel accu looks good, much
> cheaper for the same energy that NiCad.
>
> Thanks for all the tips!
>
> Wouter
>
> --
Just a comment..
If possible , I go out of my way to use SLA batteries.
Because....
They are Cheap
Work in a very wide temp range (including -30degC)
Can stay on full charge for a very long time (NiCd killer)
Simple charging scheme

The down side is the minimum terminal voltage, weight and lack of
full range fast charge. A PIC like 12C672 (With suitable power
mosfet) can make a nice SLA battery minder and load control.

90% all all my other portable gear I built (those not using SLA's) use
primary cells like alkaline or lithium ( lithium iron disulphide!...not
lithium manganese dioxide which are only good for low current
applications ).
I have had a very annoying history with NiCds and they are now on
the use at last resort list.
_____________________________

Lance Allen
Technical Officer
Uni of Auckland
Psych Dept
New Zealand

www.psych.auckland.ac.nz

_____________________________

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