How to charge 3.6VDC battery with DC Power Supply
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From: Robert Roland on 3 Mar 2010 03:57 On Tue, 02 Mar 2010 15:42:21 -0800, Tim Wescott <tim(a)seemywebsite.now> wrote: >If you don't mind spending the $$ get a peak-detect charger at your >local hobby shop. Or look around and see if there are any used ones on >Craigs List -- there are probably still some electric fliers that are >converting to LiPo and have an old NiCd only charger around, or who are >upgrading. If you're going to buy a charger that can not do LiPo, make sure you get it REALLY cheap. For RC hobby, LiPo is the way forward. There are now batteries on the market that can be charged in 12-15 minutes and weigh a lot less than NiMH. -- RoRo
From: amdx on 3 Mar 2010 07:56 "jg" <juangarcia(a)sacbeemail.com> wrote in message news:a0bea318-05c8-47bb-8dc0-a61815ecf97e(a)z10g2000prh.googlegroups.com... > > I have a few Rayovac Camcorder 3.6V/2500 mAh batteries that I want to > charge. These were originally charged with a camcorder that I do not > have. However, I have the next best thing. I have a DC Power Supply > (BK Precision 1660A) with both voltage control and current control. > Basically I can set this bad boy to output any volt and current > combination. I have tried charging the batteries at 4.0v and 100mA > and let them charge for about 3 hours. Batteries never got hot (which > to me would indicate that they were never really charged.) When I > first unplug them, they register about 3.6v. However after a day or > so, their voltage drops to 2.6v or so. > > So... I am either not charging them up completely or they are no > longer functional. However, these batteries were never put in > production. They are old, but they were still in original packaging > as of a few days ago. > > Any help greatly appreciated. > > jg http://www.powerstream.com/NiMH.htm http://www.talkingelectronics.com/projects/ChargingNiMH/ChargingNiMH.html http://www.mpoweruk.com/chargers.htm http://data.energizer.com/PDFs/charger_appman.pdf http://data.energizer.com/PDFs/nickelmetalhydride_appman.pdf
From: Tim Wescott on 3 Mar 2010 12:16 Robert Roland wrote: > On Tue, 02 Mar 2010 15:42:21 -0800, Tim Wescott <tim(a)seemywebsite.now> > wrote: > >> If you don't mind spending the $$ get a peak-detect charger at your >> local hobby shop. Or look around and see if there are any used ones on >> Craigs List -- there are probably still some electric fliers that are >> converting to LiPo and have an old NiCd only charger around, or who are >> upgrading. > > If you're going to buy a charger that can not do LiPo, make sure you > get it REALLY cheap. For RC hobby, LiPo is the way forward. There are > now batteries on the market that can be charged in 12-15 minutes and > weigh a lot less than NiMH. Yup. The weight isn't as important for boats, but Ni-anything has pretty much had its day in the sun for electric flying. -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: Tim Wescott on 3 Mar 2010 13:27 Robert Roland wrote: > On Tue, 02 Mar 2010 15:42:21 -0800, Tim Wescott <tim(a)seemywebsite.now> > wrote: > >> If you don't mind spending the $$ get a peak-detect charger at your >> local hobby shop. Or look around and see if there are any used ones on >> Craigs List -- there are probably still some electric fliers that are >> converting to LiPo and have an old NiCd only charger around, or who are >> upgrading. > > If you're going to buy a charger that can not do LiPo, make sure you > get it REALLY cheap. For RC hobby, LiPo is the way forward. There are > now batteries on the market that can be charged in 12-15 minutes and > weigh a lot less than NiMH. As far as that goes, I've got a Hitec "Multi Charge-A-Matic II" that I'd _give_ away, but as far as I can tell it's only good for NiCd batteries, not NiMH (which is why it's collecting dust on a shelf). -- Tim Wescott Control system and signal processing consulting www.wescottdesign.com
From: jg on 3 Mar 2010 14:39
Status Report: I charged one of the packs overnight for 12 hours. Max current was set at 250mA. Voltage was set at 10VDC. However, actual voltage hovered around 4.5V all night. Current control took over. When I unplugged this morning, pack felt warm to the touch. By no means hot. Without load, voltage registered at 4.2V. Nice. I will now let sit for a few days and see how long it holds. Question: Based on what I have learned, I should be able to charge these in series w/o any issues, right? Well, maybe. Given the voltage unpredictability of NiMH, the voltage drop may not be shared equally across the packs. However, based on data from last night, Current is the dominating factor here... so it might just work. jg |