Any reason why rechargeable AA's would all of a sudden stop working in a device that they used to work flawlessly in? Alkaline's still work. No menu on this device so no way to select battery type. It's a self powered monitor that also can run on AA's.
Do you know the age of them? I have had some refuse to work after 8-10 years. My charger will give me some rudimentary health signs, but I did have a 9V that died suddenly (after a long period of storage).
Only a couple years old. Panasonic Eneloop and I have many. Also tested every one of them. They all have a full charge and work fine in other devices.
In that case, focus on the device. Are the device's battery contacts pushed down and/or weakened? I have brought back a few devices with intermittent power by gently bending the contacts outward toward the battery such that the battery can barely move once inserted.
Everything is as new. Plus alkalines and lithiums work. Just/doesn't like rechargeables anymore. The monitor takes 8 AA's.
Could the rechargeables degraded to not put out enough power to keep the device happy? Measure the voltage on the suspect batteries.
Replacing with a "known good" set (aka new) might also be a good next step.
Quote from: Fatah Ruark (aka MIKE B) on June 01, 2022, 04:57:01 PM
Could the rechargeables degraded to not put out enough power to keep the device happy? Measure the voltage on the suspect batteries.
Replacing with a "known good" set (aka new) might also be a good next step.
That's what I thought. I tried 4 sets of rechargeables at 8 batts per set and none would fire this up. All batts are relatively new. On the flip side I can throw in random alkalines and it fires right up.
As far as I know, rechargeables are approx. 1.25V whereas alkalines are 1.5V (to start). Most devices are fine at 1.25V but apparently not your batteries are starting out a little less and your device does not like lesser voltage (is my guess.)
Quote from: vanark on June 01, 2022, 09:37:45 PM
As far as I know, rechargeables are approx. 1.25V whereas alkalines are 1.5V (to start). Most devices are fine at 1.25V but apparently not your batteries are starting out a little less and your device does not like lesser voltage (is my guess.)
Yea that's the only logical explanation. It liked them for awhile though and that makes no sense. I see that Lithium AA rechargeables put out 1.5 volts. 8 with charger costs about the same as 8 Eneloops.
I wonder if something failed internally that allows the monitor to operate on a lower voltage. :shrug:
Rather than mess around with buying more Eneloops (I have 20 already) I picked up some Tenovolt 1.5V rechargeable Lithiums. Problem solved! I guess my device frowns on less than 1.25 volts per battery and I probably have a few Eneloops that have dropped below that even when showing fully charged.