On 8/28/05, Stef Mientki wrote: > > > microsoftwarecontrol wrote: > > >OK, let me talk more about battery. > > > >I worked with my charger for quite long. > >I found: ending method > >dV and -dV, T rising do exist, but > >they exhibit really in the messy way and seldom > >identical, for even same battery, same SW and > >same HW. I now believe how the bettery > >have been used, discharged, the betteries > >are used in RC, digital CAM, flash light, > >on/off once or experienced many on/off, all lay a leg > >on battery ending behaviors when you recharge them. > > > >Unrealiable and useless are my conclusion > >to dV or T rising ending method. > > > >Now I am trying a totally new charging concept > >and hope to cope with the complexity. Main method > >is pulsing. > > > > > What's so new about your method ? > > I'm using a puls quick charger (10 minutes) for over 12 years now for NiCd, > with only dV/dT detection > and it works really great (it can even "repair" damaged batteries). > > I think all NiMh chargers, sold at this moment are dV/dT chargers. > So that's my second question, > why do you think dV/dT is unreliable (if you do it in the right way ;-) Hi Stef, I'm a little agree with this "no name" piclister. Without any question dV/dT it's a common used methode. However there are situation when the small dV can't be sensed well. Even the battery is complete charged, the charger seen as is not, hence the situation of overcharging. maybe you saw this at least once. Also, maybe you've noticed, the quick charger is very good for batteries which are also fast discharged. If you're trying to use a 10 minutes charged 1Ah battery with 100mA/10 hours will never works in the last 3...4 hours. But if you'll "regenerate' the battery with very slow charge-discharge 2...3 cycles it looks like the battery is ok (which is not, only for the first maybe second next discharging cycle). Talking from the chemistry inside the battery , there is no much difference between fast reflex charging and standard low time charge-discharge. The only benefit of a reflex charge I saw, it's the "feeling" of regeneration (which is just an impression, if it's followed by complete measurements). But I didn't experiment with reflex charger too much. Fortunately I don't want to repeat this experience on more than 100 batteries and 5 different producers. :) cheers, Vasile -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist