Test/review of Energizer D 2500mAh NH50 (Silver)

Energizer D 2500mAh NH50 (Silver)

Official specifications:

  • Classification: Rechargeable

  • Chemical System: Nickel-Metal Hydride (NiMH)

  • Designation: ANSI-1.2H4

  • Nominal Voltage: 1.2 Volts

  • Rated Capacity: 2500 mAh* at 21°C (70°F) 500mA discharge to 1V

  • Typical Weight: 73.0 grams (2.6 oz.)

  • Typical Volume: 57.0 cubic centimeters (3.5 cubic inch)

  • Terminals: Flat Contact

  • Jacket: Plastic

Maximum temperature raise at different discharge currents: 1A:+0,3°C, 2A:+0,6°C, 3A:+1,3°C, 5A:+2,6°C, 7A:+3,6°C, 10A:+4,7°C, 15A:+5,3°C
This is low capacity D cells from one of the big brands and as can be seen on the photos the capacity is with a fairly discrete font.

The two cells matches fairly well and can deliver the rated capacity. At high current they are considerable better than AA cells.


These batteries do not have more capacity than AA batteries, but are better at high current. They feel very lightweight and my guess is that they contain a smaller cell inside.

Notes and links

How is the test done and how to read the charts
Compare to other AA/AAA batteries: Alkaline/NiMH/Lithium

Judging by the 2,600 reviews on Amazon, they are certainly popular. About a third of the cost of two Powerex D cells, but also 1/4 the capacity.

Yes too bad they could not have made them at least 5000mAh. Still in some applications better than messing with an AA in an adapter.

Thanks for the review.
It seems odd to see such a low capacity big cell.
As you suggest it, there may well be a AA cell inside.

Not AA, but a Sub-c cell.

Did you open it?

Last time i had to deal with sub-Cs they where nowhere close to 2500mAh… but they where cheap ones.

PS: please cut this cell in half - and let’s see what’s inside! })

Not yet.

I will probably open it when the weather get better, I prefer to open batteries outside.

Thanks for the review HKJ!

In this thread there a cutaway of the D Energizer www.budgetlightforum.com/node/34663?page=1

Right here to be exact.

Totally looks like a sub-C cell spot-welded inside.

The next ones are somewhat pricey (and ;-) heavy), but more like the real deal:

Related test: http://www.torchythebatteryboy.com/p/nimh-d-size-batteries.html

Cheers ^:)

Those ratings are definitely BS.
Even high end sub-C cells for RC are 5000-6000mAh max.

A few years back when I built a lot of maglites with D cells, about the best D Nimh cell was the Powerex 11000mah from Maha Energy. Not cheap at all.
I guess you have to pay for the extra capacity. Too expensive for me to buy 4 to run in a mag. If your up for it HKJ it be nice see these tested. From what I have read they generally give more than 11000mah at low currents. Can’t find any hard data to back that up though.
Thanks for all your testing HKJ, valuable info.