General > General Technical Chat
Is it just me or have rechargeable NiMH improved?
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Zoli:

--- Quote from: Bud on November 14, 2022, 01:13:11 pm ---
--- Quote from: Zoli on November 14, 2022, 05:17:30 am ---
--- Quote from: Bud on November 14, 2022, 04:45:36 am ---
--- Quote from: deadlylover on November 14, 2022, 02:49:45 am ---If you have an IKEA nearby, their LADDA series of batteries are excellent .

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In Canada IKEA discontinued LADDA batteries. Too bad, they were cheap and good. I liked them.

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Hmmm:
https://www.ikea.com/ca/en/search/products/?q=ladda
Last weekend(Nov 5) Ikea Coquitlam was pretty full of them; sometimes they're sold out, even for weeks in a row.

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Those are rechargeables. I was talking about regular non-rechargeable batteries, in yellow jacket.

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The alkalines were called ALKALISK, not LADDA.
tom66:

--- Quote from: alm on November 14, 2022, 01:37:24 pm ---When Sanyo Eneloop was introduced in 2005, they compared the self discharge rate of the 2000 mAh (typical) Eneloop to 2500 mAh (typical) regular NiMH batteries, where the Eneloop had 85% capacity left after one year, and the regular NiMH battery was basically flat. Now Panasonic (who bought the Eneloop brand from Sanyo in 2013) sells Eneloop pro batteries with 2500 mAh typical capacities that have 85% capacity left after one year. So your claim is that the 2500 mAh (typ) Eneloop pro batteries are the same as the 2500 mAh (typ) non-LSD batteries Sanyo produced in 2005?

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It's not my claim, just something I've seen speculated about on the Internet.  It does line up with LSD NiMH batteries being notably lower capacity than NiMH has technically been able to achieve. 
bdunham7:

--- Quote from: tom66 on November 14, 2022, 04:12:11 pm ---It's not my claim, just something I've seen speculated about on the Internet.  It does line up with LSD NiMH batteries being notably lower capacity than NiMH has technically been able to achieve.

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AFAIK, the LSD feature is largely due to a thicker and otherwise improved separator.  I suppose if the ultra-high capacity versions used thinner separators to leave more space to increase capacity, they might suffer increased self-discharge, so 'going back' would improve this a bit.  However, modern LSD NiMH are much, much better than older NiMH, even the ones that had much less capacity.  I'm pretty sure present-day LSD represents a significant improvement over any previous NiMH cells, at least at the consumer level in standard cell configurations.
jmelson:
Take the new cells and old, and compare weight.  My kids bought me some hardware store Energizer NiMh D cells, and I could tell immediately by their weight that they must have had about an AA cell worth of real cell inside.  When new, they would run my flashlight for about 30 minutes.  Now, that's down to 10 minutes, and I just got some new ones off eBay that weight tells me they at least have (something) inside.  I will have to use them to see how much longer they last.
Jon
alm:

--- Quote from: tom66 on November 14, 2022, 04:12:11 pm ---It's not my claim, just something I've seen speculated about on the Internet.  It does line up with LSD NiMH batteries being notably lower capacity than NiMH has technically been able to achieve.

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I've seen a lot of speculation on the internet... It does not line up not with the fact that LSD batteries have increased in capacities to match NiMH batteries from 15 years ago, but have a much lower self discharge than said batteries from 15 years ago. Both LSD and non-LSD batteries have increased in capacity, yet the difference in self discharge rate has stayed the same. That is more consistent with LSD batteries using a different construction that limits capacity. The Eneloop press release mentions some improvements like a different alloy for the negative electrode.

Can you find data showing the self-discharge rate of <=2000 mAh NiMH batteries before the introduction of Eneloop having a similarly low self-discharge rate as the 2000 mAh (typ) Eneloop batteries?
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