I had a netbook, about four years old at the time, running on XP, that had a "dead" battery. No problem, as I would just run it on the charger. I changed the OS to UBUNTU and !suddenly! the battery could charge. Checking the charge history (which I could not do in XP) I found that the OS had checked the battery, found nothing wrong with it and proceeded to charge it. Clearly, there was something in XP preventing the charge sequence. You could argue that there was something going on to protect the computer but Occam's Razor suggests to me that it merely counted out time or number of charges and decided at that point that the battery was toast and refused to play.
I think a truly dead battery is a very rare occurrence. > On 25 December 2017 at 10:51 Alex Sarbu <[email protected]> wrote: > > > Indeed, "intelligent" chargers would detect "bad" batteries and refuse > to charge them; and often you can jump-start them in a "dummy" > charger. Apparently that's a feature. > You could use the BC 900 to test or refresh the batteries (don't leave > the charger unsupervised! - nor near flammable materials). I assume > the old batteries had no signs of physical damage/leaks/corrosion. > > Alex > > On Tue, Dec 19, 2017 at 8:00 PM, Igor PDML-StR <[email protected]> wrote: > > > > > > I've discovered that NiMH AA batteries that were in the old Pentax DS body > > (remember those?) were completely dead. > > I tried to put them in renown La Crosse charger (BC-900), and that refused > > to charge them. > > > > I was able to resuscitate them by putting them into a "fast" Duracell > > charger, and then trying to start charging a few times by plugging that > > charger into the power outlet. At first, that charger also refused to charge > > them, but after 3-4 attempts, the first pair started charging, and then > > (after that pair was somewhat charged, so that I can put them in BC-900), I > > did 2-3 more attempts with the second pair, and it worked. > > > > I suspect BC-900 was a bit too gentle with the initial charge attempt. > > But it is also possible that it could have worked if I tried a few more > > times. > > > > I am not sure how well these batteries will work, the time will show. > > But at least this allowed to charge them up. > > > > An alternative would be to use a 1.5 V power supply, but this trick was > > simple enough. > > > > I thought this might be useful to somebody. > > > > > > Igor > > > > > > -- > > PDML Pentax-Discuss Mail List > > [email protected] > > http://pdml.net/mailman/listinfo/pdml_pdml.net > > to UNSUBSCRIBE from the PDML, please visit the link directly above and > > follow the directions. > > -- > PDML Pentax-Discuss Mail List > [email protected] > http://pdml.net/mailman/listinfo/pdml_pdml.net > to UNSUBSCRIBE from the PDML, please visit the link directly above and follow > the directions. -- PDML Pentax-Discuss Mail List [email protected] http://pdml.net/mailman/listinfo/pdml_pdml.net to UNSUBSCRIBE from the PDML, please visit the link directly above and follow the directions.
