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Author Topic: Rechargeable batteries  (Read 1035 times)

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Offline ts

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Rechargeable batteries
« on: June 01, 2022, 01:30:51 PM »
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.

Offline dyneq

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Re: Rechargeable batteries
« Reply #1 on: June 01, 2022, 01:44:28 PM »
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).

Offline ts

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Re: Rechargeable batteries
« Reply #2 on: June 01, 2022, 02:19:03 PM »
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.

Offline dyneq

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Re: Rechargeable batteries
« Reply #3 on: June 01, 2022, 02:43:58 PM »
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.

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Re: Rechargeable batteries
« Reply #4 on: June 01, 2022, 03:10:51 PM »
Everything is as new. Plus alkalines and lithiums work. Just/doesn't like rechargeables anymore.  The monitor takes 8 AA's.

Offline Fatah Ruark (aka MIKE B)

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Re: Rechargeable batteries
« Reply #5 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.

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Offline ts

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Re: Rechargeable batteries
« Reply #6 on: June 01, 2022, 07:08:22 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.

Offline vanark

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Re: Rechargeable batteries
« Reply #7 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.)
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Offline ts

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Re: Rechargeable batteries
« Reply #8 on: June 02, 2022, 08:23:26 AM »
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:
« Last Edit: June 02, 2022, 09:02:43 AM by ts »

Offline ts

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Re: Rechargeable batteries
« Reply #9 on: June 04, 2022, 10:48:33 AM »
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.

 

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