Test / Review: Eneloop AA HR-3UWXB 2450mAh (Black)

Eneloop AA HR-3UWXB 2450mAh (Black)

Official specifications:

  • Capacity typical: 2550mAh
  • Capacity minimum: 2450mAh
  • Nominal voltage: 1.2V
  • Fast charge: 2550mA
  • Life cycles: up to 500
  • Self-Discharge: approx. 85% capacity after 1 years

These eneloop has higher capacity and shorter charge retention time than the white version

Maximum temperature raise at different discharge currents: 1A:+1,3°C, 2A:+3,7°C, 3A:+6,5°C, 5A:+13,0°C, 7A:+19,5°C, 10A:+23,9°C,

There is some variation between the cells.
Note: Small capacity differences are much less a problem for NiMH, than for LiIon.


These batteries can maintain power for a long time and can also deliver a high current.
I wonder why they only have a 1 year rating, compared to the 1900mAh eneloops 5 year rating, does these batteries have a shorter lifetime?

Notes and links

How is the test done and how to read the charts

Thanks for the review.
Is it possible to use the comparator for the eneloops, to see the discharge graphs over each other?


Should the below say 2450mAh?

Official specifications:
•Capacity typical: 2550mAh
•Capacity minimum: 1450mAh
•Nominal voltage: 1.2V
•Fast charge: 2550mA
•Life cycles: up to 500
•Self-Discharge: approx. 85% capacity after 1 years

I will not setup a comparator, with only 3 different types of NiMH.

Thanks, I have fixed it.

Thanks for the clarification, I had searched the nimh in the comparator but had not found it.
Are the voltage curves similar?

The xx have less useable cycles and higher self discharge than the whites.

XX 500 cycles 85% remaining after 1 year
White 1800cycles. 90% after 1 year and 70% remaining after 5 years


At the current time I have two comparators, one for 18650 and one for small LiIon batteries.

The next one I make will probably be for 26650.

At the current time you have to uses two browser windows to compare the curves. This is not ideal, but will have to work for now.

“I wonder why they only have a 1 year rating, compared to the 1900mAh eneloops 5 year rating, does these batteries have a shorter lifetime?”

could it be eneloops have been around since 2005 so they have data, while the XX was released 2011 so they only have 1 years complete data?

THANKS for the review! :slight_smile:

Many thanks, HKJ.
I got these some time ago to use in my p&s cameras and flash units. They work great :smiley:

So, are these the best (or close to the best) AA NiMh batts you can get?

Thanks for the review, mate!

I already had them from some time ago, purchased in that moment at a good price


I have 2 packs of 4, so 8 in total… 4 of them waiting for a nitecore ea4…. if the money allows me to buy :stuck_out_tongue:

Thanks a lot for the review! Frontpage’d and Sticky’d.

HKJ, thanks for great reviews as usual.
I am wondering do you keep record of nominal voltage after charging, for example one day after charge, one week after charge, etc.
I raise this because I found that some brand of LSD has lower voltage after fully charge. Eneloop claim that their voltage is higher than other LSD.

I have come to believe that claim means higher voltage under load because of their lower internal resistance, in my experience the voltage is the same, i have a device that says batteries are dead at 90% an they react to eneloop the same as other NiMH batteries

I was thinking is Eneloop more suitable than other LSD for those low load and a lot resting application like TV remote control, wall clock, etc if they claim they have higher voltage. If under open circuit condition, is all LSD going to have almost same voltage after resting for a few days after charging?

I have noticed that 1.37V means resting full for eneloop after a week or so, others are not lsd cells and fall quickly
i’m referring to the white cells, second generation, not the ones tested in this thread, i don’t have any of them

That could be interesting, but I do not do it.

So the chart says the cell is a Panasonic. Do Panasonic make all the Eneloop cells for Sanyo, or just these?

I see they are 1.5g heavier than the 2050 mAh Eneloops, but if I do the math correctly it looks like they may yield roughly 10% more efficient capacity for the weight ratio.

Panasonic has bought Sanyo…but still products from Sanyo will exist because it has a good name…the newest eneloop batteries have a big Panasonic letters printed over the whole battery and only a smaller eneloop written on them.

I would agree the energy density of the black is about 14 percent better.
Black energy density. 2.968÷29.9=0.099mWh/g
White energy density. 2.254÷25.9=0.087mWh/g

Just a quick calculation based on the 1A discharge from HKJ, with ignoring the different size measurement…

See the eneloop 2005-2013 overview thread.....for more info about eneloop