problem with NiMH batteries in digital cordless telephone - diyAudio
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Old 23rd July 2002, 09:10 PM   #1
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Join Date: Feb 2002
Location: Germany
Default problem with NiMH batteries in digital cordless telephone

I have a problem that is only marginally diyaudio, if one dares consider telephony a form of audio...

I have had a Samsung DECT cordless phone for about 3 years. DECT stands for Digital European Cordless Telephone and , being a small version of the GMS digtal mobile phone standard, has been the standard here for ages. I believe it is known in the U.S. as "900 MHz digital cordless phone", but I may be wrong about the frequency.

Anyway, the NiMH rechargeble batteries were beginging to age. Samsung having kindly chosen the "micro cell" or AAA form factor rather than something proprietary, I chose the highest capacity of AAA NiMH batteries, which happened to be Panasonic 7=0 mAh NIMH "for DECT" batteries.

Just prior to replacement, the old batteries gave me about two days of standby or two hours of talking, which is about half of the original performance. With the new batteries, I have about 6 hours of standby away from the base station and 45 minutes of talking before there are dropouts. Dropouts will occur even with the battery charge meter being 3/3 whereas with the old batteries it had to have been down to 1/3 for a long while before dropout occured.

Is this a problem related to battery selection? Or might something like a cap have given up inside the phone coincidentially?



P.S. The original batteries had green plastic coating with no brand name except the Samsung part number. I believe rated capacity was 550 mAh but can't find the manual right now. I am VERY sure they were NiMH rather than NiCd, both according to package text and manual.
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Old 23rd July 2002, 09:25 PM   #2
Keld is offline Keld  Sweden
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Location: Borås, Sweden, Tellus

You have let the batteries get charged and discharged 2-4 times before they will have full capacity. If thats alredy done: Not a clue!
"What is done by what is called myself is, I feel, done by something greater than myself in me."
James Clerk Maxwell. 1879
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Old 23rd July 2002, 09:40 PM   #3
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Join Date: Feb 2002
Location: Germany
That has been done already. The batteries have been in place for about 3 months. I have even let the phone discharge by standby for several days even as I understand there isn't supposed to be any memory effect in NiMH batteries....
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