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.
