Received from Mark Hanchey at 10/19/11 01:03 UTC: >On 10/18/2011 2:35 PM, V G wrote: > > On Tue, Oct 18, 2011 at 8:33 AM, Mark Hancheywr= ote: > > > >> I went the PIC route for a battery charger. It wasn't the lowest part > >> count though. Each battery is charged to get the max charge . It has = a > >> routine where the batteries charge for a period of time, about 10 > >> minutes, then are switched off, allowed to rest for 20 seconds and th= en > >> the voltage checked with a load switched in by the PIC. Each battery i= s > >> connected to a separate ADC on the PIC and if below the limit is charg= ed > >> more. The great thing about this setup is that it never heats up the > >> batteries much during the charging routine and the run time on the > >> batteries is longer than with any charger I had used before. > >> > >> > > I thought about this method before, but never went through with it. I'm > > assuming you're talking about NiMH. What voltage threshold did you use? > >I used 1.28 for the voltage under load with a 100ohm resistor switched >through a FET. >The method of charging is called burp charging, there is a NASA paper on >it where they use very short >charge and rest periods , only ms long. >http://dnd.hu/letoltes/AdvanceTec_whitepaper.pdf > >It works well and the batteries don't wear out as often. >Mark This isn't a NASA paper. It's promotional literature from the manufacturer= =20 of the burp charger. --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .