Author Topic: Eneloop AA cells load tested,are Panasonic better than Sanyo?  (Read 9608 times)

Offline chad

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #30 on: October 23, 2016, 03:24:04 PM »
Sorry.....

Back to your regularly scheduled program :P

Offline Carl

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #31 on: October 23, 2016, 06:07:54 PM »
Sorry.....

Back to your regularly scheduled program :P

No worries Chad
Stop complaining about life and start Celebrating it .

I've reached the age where there is little left to learn the hard way.

If you had only one year,one month,or one day...Would you live your life differently?

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Offline Ralph

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #32 on: October 25, 2016, 09:29:58 AM »
I have to run the same batch of gen1s through another test. This time I'll try a 1amp discharge. BTW, I liked the car start comment!  Fact is I have 2 lights that run on Li ion and the only one I could measure does draw 1amp. I should check it's draw with an Eneloop.
After the 2amp discharge I used an Xtar charger to recharge. Even at it's low charge setting (0.5a) it charged quite a bit lower and of cause took longer. My guess is it was limiting cell volgage by charge current. The Xtar charger also handles Li cells so the charge voltage monitoring makes sense. I'll have to check that.

Offline Carl

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #33 on: October 25, 2016, 10:12:54 AM »
Fast charging (above 1/2 amp) only stresses the cells and causes useful life problems,
I usually charge at 200 ma,375 ma ,or 500 ma depending on the charger and my hurry
and as I have over 40 'spare' ENELOOP cells ,I rarely get in a hurry.
Stop complaining about life and start Celebrating it .

I've reached the age where there is little left to learn the hard way.

If you had only one year,one month,or one day...Would you live your life differently?

Radios are pointless without someone trained to use them.

Offline Greekman

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #34 on: October 25, 2016, 02:29:57 PM »
Carl, charging NiMh at 0.2-0.3A might cause any charger to miss termination when it uses -dV/dT to detect full.

Offline Carl

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #35 on: October 25, 2016, 02:38:56 PM »
Carl, charging NiMh at 0.2-0.3A might cause any charger to miss termination when it uses -dV/dT to detect full.

You should tell them to make a better charger....
Stop complaining about life and start Celebrating it .

I've reached the age where there is little left to learn the hard way.

If you had only one year,one month,or one day...Would you live your life differently?

Radios are pointless without someone trained to use them.

Offline Greekman

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #36 on: October 25, 2016, 03:06:07 PM »
I wrote "any" charger.
it is endemic to all chargers that use-dV/dt. the charger detects a small, short in duration drop in battery voltage when the battery gets full. in low charge current the chip may miss this voltage drop, if there is any in low current
It probably can be done, but what woudl the charger cost?

Offline Ralph

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Re: Eneloop AA cells load tested,are Panasonic better than Sanyo?
« Reply #37 on: October 28, 2016, 10:53:24 AM »
I dont recall if the LaCrosse charger had a timer to stop charging after so many hours, but I know the temperature sensor works. I charged a cell too fast once and the charger stopped when the cell got too hot. It was really hot! Human error created the situation and the charger's fail safe worked. Still, I would not want to repeat that and I am sure it did shorten that cell's life. I like the LaCrosse and would still be using it if I didnt have a few Li cells now. I switched to an Xtar which handles both. It doesnt have all the neat features of the LaCrosse, but it has a timer to stop charging and no trickle charge once full.
I re-ran my gen1 Eneloops at 1amp. Compared to my previous 2amp run their capacity was between 100 and 200mAH higher, and the 1 'weak' cell was still obvious compared to the rest. They all come in at around 1500mAH.
I ran across a test I ran on the CBA using new Duracell AA alkaline batteries. At 500mA the Duracell was close to the capacity of an Eneloop using the same 1v cutoff. Below 500mA a Duracell will outlast an Eneloop... once.