Toto Posted February 21, 2016 Report Share Posted February 21, 2016 I had a number of dead battery packs on a couple of cordless drills that were going to cost £300 to replace so I bought a load of cells to rebuild them myself. http://www.amazon.co.uk/gp/product/B00H2GQFOA?psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00 These are listed as 1.2v, the same as the originals but when I built the 14.4 volt pack up and checked the voltage it was 17.5v. I built a second pack to make sure I hadn't damaged the first but again, 17.5v. When I checked the individual cells they were showing 1.45v instead of 1.2v. I don't know whether or not I should drain these packs and put them through a couple of charge cycle to see if that makes a difference because I don't want to risk burning the drill out. Does anyone know how tolerant a cordless drill is to voltage increases? I could take a couple of cells out and drop the voltage to 14.5 ish but obviously I'll lose storage capacity and if the voltage drops naturally with time I'll lose power too. Any help would be appreciated. Quote Link to comment Share on other sites More sharing options...
KnarlyCarl Posted February 21, 2016 Report Share Posted February 21, 2016 14.4v ... does that make it the old dewalt drills or what brand are we talking here? Usually the voltage is off by a little bit and out doesn't make a big difference, if you ran the drill with your rebuilt batteries, I imagine the voltage would drop to nominal levels and will be fine. Sent from my SCH-I535 using Tapatalk Quote Link to comment Share on other sites More sharing options...
Toto Posted February 21, 2016 Author Report Share Posted February 21, 2016 OK, maybe I'll just run the battery out under low load until it's had a couple of charges then. Its a Draper expert BTW, this model I think. http://www.amazon.co.uk/Draper-41407-14-4-Volt-Combination-Batteries/dp/B000PJAN4Y Quote Link to comment Share on other sites More sharing options...
Logan Posted February 21, 2016 Report Share Posted February 21, 2016 14.4v ... does that make it the old dewalt drills or what brand are we talking here? Usually the voltage is off by a little bit and out doesn't make a big difference, if you ran the drill with your rebuilt batteries, I imagine the voltage would drop to nominal levels and will be fine. Sent from my SCH-I535 using TapatalkI agree most of the times the voltage is a bit off Quote Link to comment Share on other sites More sharing options...
Toto Posted February 21, 2016 Author Report Share Posted February 21, 2016 So 3 volts isn't a big deal then? just out of interest what would be too much? Quote Link to comment Share on other sites More sharing options...
JimboS1ice Posted February 21, 2016 Report Share Posted February 21, 2016 When you apply load the voltage should drop to the 14.4, that's how dewalts calls the 20v max because that is their no load voltage, it drops to 18v under load.JimboSent from my iPhone using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Fazzman Posted February 21, 2016 Report Share Posted February 21, 2016 That 3 volts is gonna go away as soon as you pull the trigger most likely. 14.4 is pretty old school. You might wanna look into upgrading someday,not always worth it to rebuild the batts. Draper isnt a name you here much aboout,but they have good stuff. I have a Japanese made Draper ID micrometer set. Quote Link to comment Share on other sites More sharing options...
Toto Posted February 21, 2016 Author Report Share Posted February 21, 2016 Great, thanks for the info everyone, I know the new stuffs a lot better but I just hate binning perfectly good tools! Quote Link to comment Share on other sites More sharing options...
KnarlyCarl Posted February 21, 2016 Report Share Posted February 21, 2016 Great, thanks for the info everyone, I know the new stuffs a lot better but I just hate binning perfectly good tools!Put it in your "art" bin lolSent from my SCH-I535 using Tapatalk 1 Quote Link to comment Share on other sites More sharing options...
Donsout Posted March 4, 2021 Report Share Posted March 4, 2021 Great insights guys. I'm glad I found this post as I was about to do something dumb! I never thought that in my area with a such a diminishing quality of power. I thought that the governors are taking care of the power grid in the area a long time ago, but unfortunately that's not the case. Pretty much I'm trying to open my store and the power grid in the area doesn't support all the devices and machinery that I need to have. Just like enough to talk with one of the guys from https://www.ashleyedisonuk.com/world-voltages/ They were really helpful in assessing the situation and providing valuable guidance to what I can do. Quote Link to comment Share on other sites More sharing options...
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