powering from NiCads
w. v. ooijen / f. hanneman email (remove spam text)
> Did you measure the cell under load? I have a sneaking suspicion that if
> made the battery pack (5 batteries), and put them under a 30mA load (160
> resister) then you'll find it almost exactly 6 volts.
I measured a loaded NiCad with 330 ohm resistor. 1.34 Volt.
The responses on my question have been very informative, so far:
- watch out for 4.5 - 5.5 PICs
- don't use NiMh
- include some reserve for self-discharge
- consider a low-dropout regulator
- consider a DC/DC converter
I am now looking into using an LT1301 step-up converter, the cheepest one I
can get (I'm aonly a hobbyist, so I'm limited to what the local shops
offer). 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!
http://www.piclist.com hint: The PICList is archived three different
ways. See http://www.piclist.com/#archives for details.
See also: massmind.org/techref/power/batterys.htm?key=nicad