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Forum Index : Other Stuff : Advice on NiMH for cordless headphones

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DD_FXA

Newbie

Joined: 20/07/2011
Location: Australia
Posts: 1

Posted: 11:50am 20 Jul 2011

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Hi all,
This is a bit trivial compared with going green, and off the grid etc, but I thought someone here might have some advice for me.
I have a nice pair of Sennheiser cordless headphones I use to watch TV after the missus heads off to bed, but none of the battery packs will deliver for more than 5 minutes any more.
Rather than just buy more (which I did previously), I was thinking I'd wire up a couple of AAs (either 2700mAh ones, or 2000 eneloops) instead.
The original battery packs (BA-151) comprise a pair of button cells (nominally 2.4V 80mAh). Given that they normally give at least an hour or two each, I figure 2500s should be good for at least 30-60 hours on a charge. I normally use them every night, so I don't think I need the LSD feature of eneloop{/I]s - unless ...
Is it better to keep topping them up after each use (so maybe eneloop lites, with lower capacity @1000mAh, but good for 2000 cycles), or let them run till discharged (the headphones actually cut out at about 2.0V)?

Cheers, DD

VK4AYQ
Guru

Joined: 02/12/2009
Location: Australia
Posts: 2539

Posted: 02:44pm 20 Jul 2011

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Hi DD

I have found it is better to run till flat rather than top ups as I use them in my camera and if I keep charging every time I use it they do not last long 3000ma version.

Bob

Foolin Around

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