replacing batteries in Norelco shaver
in [Repair]
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From: Ken G. on 2 Sep 2005 19:54 IT WORKS ALREADY READ MY FIRST POST .
From: Asimov on 29 Sep 2005 11:51 "Jim Yanik" bravely wrote to "All" (25 Aug 05 23:17:16) --- on the heady topic of "Re: replacing batteries in Norelco shaver" JY> From: Jim Yanik <jyanik(a)abuse.gov.> JY> Xref: core-easynews sci.electronics.repair:340643 > Anyone ever replace batteries in a Norelco (or other brand) shaver? > Anything I should be aware of or watch out for? Seems like it should > be a pretty straight forward procedure. > > TIA JY> NiMH cells have a more complicated charge requirement than NiCd. JY> Unless you plan on designing a new charger,you should only replace JY> with NiCd cells similar to what you removed. Riding my bike I found a cellphone flattened by traffic on the side of the road. Its Li-ion battery seemed undamaged and it took a controlled charge okay. I was thinking of replacing the 2 sub-C nicads in a hand driver with it, as the Li-ion cell has a 1,000mA/hr spec on the label. It seems impossible for such a small battery (2"x1.5x1/4"thick). There are 3 contacts on the cell, beneath is a pcb with surface mount IC's. One terminal is labelled TH, what is it, thermal monitor? A*s*i*m*o*v .... That was a fascinating period of time for electronics
From: Jim Yanik on 29 Sep 2005 18:28 "Asimov" <Asimov@-removethis-bbs.juxtaposition.dynip.com> wrote in news:MSGID_1=3a167=2f133.0_430f479d(a)fidonet.org: > "Jim Yanik" bravely wrote to "All" (25 Aug 05 23:17:16) > --- on the heady topic of "Re: replacing batteries in Norelco shaver" > > JY> From: Jim Yanik <jyanik(a)abuse.gov.> > JY> Xref: core-easynews sci.electronics.repair:340643 > > > Anyone ever replace batteries in a Norelco (or other brand) shaver? > > Anything I should be aware of or watch out for? Seems like it should > > be a pretty straight forward procedure. > > > > TIA > > > JY> NiMH cells have a more complicated charge requirement than NiCd. > JY> Unless you plan on designing a new charger,you should only replace > JY> with NiCd cells similar to what you removed. > > > Riding my bike I found a cellphone flattened by traffic on the side of > the road. Its Li-ion battery seemed undamaged and it took a controlled > charge okay. I was thinking of replacing the 2 sub-C nicads in a hand > driver with it, as the Li-ion cell has a 1,000mA/hr spec on the label. > It seems impossible for such a small battery (2"x1.5x1/4"thick). There > are 3 contacts on the cell, beneath is a pcb with surface mount IC's. > One terminal is labelled TH, what is it, thermal monitor? > > A*s*i*m*o*v > > ... That was a fascinating period of time for electronics > > I don't know what the "TH" means.Possibly "THermal",maybe a thermistor for temp monitoring. You could try measuing resistance between TH and each other terminals,perhaps while changing the packs temp by hairdryer. Wood Magazine recently had an article on a new drill/driver that uses Li- Ion cells in a 28V pack with a microprocessor controller IC built into each battery pack,it not only controls the charge,gettting the most from the cells,but it counts charge cycles and keeps track of battery life.According to the article,some Li-Ion formulations do not have a high discharge current capability,that it shortens cell life.But Milwaukee says their cells are different.Their cells are 4 volts apiece.(Is 4.8v/cell 'standard' for Li-Ion?) -- Jim Yanik jyanik at kua.net
From: Jack Edin on 29 Sep 2005 20:47 I put NiMH cells in mine a year ago... I let it charge a bit longer, as the capacity is much higher... Works great! Did the same with my Uniden and Panasonic cordless phones. I let 'em charge fully, and they last a l-o-n-g time! And I didn't redesign the charger. These are trickle chargers, gentlemen. A fast charger would matter... These do not. IMHO... Jack :) >> JY> NiMH cells have a more complicated charge requirement than NiCd. >> JY> Unless you plan on designing a new charger,you should only replace >> JY> with NiCd cells similar to what you removed.
From: H. Dziardziel on 29 Sep 2005 20:53
On Thu, 29 Sep 2005 15:51:30 GMT, "Asimov" <Asimov@-removethis-bbs.juxtaposition.dynip.com> wrote: >"Jim Yanik" bravely wrote to "All" (25 Aug 05 23:17:16) > --- on the heady topic of "Re: replacing batteries in Norelco shaver" > > JY> From: Jim Yanik <jyanik(a)abuse.gov.> > JY> Xref: core-easynews sci.electronics.repair:340643 > > > Anyone ever replace batteries in a Norelco (or other brand) shaver? > > Anything I should be aware of or watch out for? Seems like it should > > be a pretty straight forward procedure. > > > > TIA > > > JY> NiMH cells have a more complicated charge requirement than NiCd. > JY> Unless you plan on designing a new charger,you should only replace > JY> with NiCd cells similar to what you removed. > > >Riding my bike I found a cellphone flattened by traffic on the side of >the road. Its Li-ion battery seemed undamaged and it took a controlled >charge okay. I was thinking of replacing the 2 sub-C nicads in a hand >driver with it, as the Li-ion cell has a 1,000mA/hr spec on the label. >It seems impossible for such a small battery (2"x1.5x1/4"thick). There >are 3 contacts on the cell, beneath is a pcb with surface mount IC's. >One terminal is labelled TH, what is it, thermal monitor? > > A*s*i*m*o*v > >... That was a fascinating period of time for electronics Li-ions can only be at best pulsed at a 2-3C rate. The TH probably is the termistor and the pcb has picofuses. How will you charger it once in the driver? Li-ion aren't for casual experimenting, as you no doubt know.. This has a nice update on consumer product Li-ion capacities. http://powerelectronics.com/mag/power_batteries_seek_higher/ |