Test/Review of Fujitsu AAA HR-4UTHC 950mAh (Black)

Fujitsu AAA HR-4UTHC 950mAh (Black)

Official specifications:

  • Nominal voltage: 1.2V
  • Typical capacity: 950mAh
  • Minimum capacity: 900mAh
  • Low self discharge (LSD)
  • Retains 85% charge after one year
  • Rechargeable up to 500 times.

Maximum temperature raise at different discharge currents: 1A:+2,3°C, 2A:+5,8°C, 3A:+9,0°C, 5A:+12,5°C
These cells are high capacity NiMH from the FDK factory in Japan.

There is very good tracking between the two cells. They can handle 5A current, but as usual it is better to use a lower current.


These cell has very good performance.

Notes and links

The batteries was supplied by FDK German for a review.

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

Great review. Thanks HKJ!

Mfg date: 2/2018
Charger: Opus C-2400
Discharge current: 0.2A

Another funny thing with the capacity figures. This cell cannot do 950mAh even if brand new, and I doubt going down to 0.8V would change anything. Where do you get those figures, Henrik?

Another example is the Panasonic NCR18650G 3600mAh (green), it's rating can only be 3300mAh minimum down to 2.5V, I guess of course. Only a miracle would make that cell hit 3600mAh under HKJ's testing conditions. Literally. :}

Cheers ^:)

I’m not following. Where did HKJ claim that it does 950 mAh?

Again, not following you. Where did HKJ claim that it hits 3600 mAh?

Are you feeling OK? :slight_smile:

Pete7874, for the love of God. Let's check:

The title of this thread is “Test/Review of Fujitsu AAA HR-4UTHC 950mAh (Black)”. And then there is the Panasonic NCR18650G 3600mAh (Green) one.

Cheers ^:)

These are just names of the cells, based on how the manufacturer identifies/describes them.

Maybe try actually reading his tests to see what figures he got (“Measured Capacity”). :slight_smile:

Fujitsu AAA


Unless I’m mistaken the 950mAh comes from Fujitsu’s claim for the battery. I just bought 2 packs of them and I only got around 850 mAh discharging at .7A.

Exactly. That is the manufacturer’s claim, not HKJ’s claim. He’s just using it as a thread title to easily identify the product.

Capacity ratings from battery companies remind me of car MPG ratings. Something to aspire to but never obtained by the consumer :frowning:

Forgot to mention that of the 80 or so 1900 mAh Enloops I’ve bought over the past 5 years none of them ever tested out at that capacity. At first I thought I had defective batteries or equipment but then I realized it was just the way things are.

However the 12 Fujitsu HR-3UTHC 2450mAh that I bought several weeks ago tested out at: 2510, 2474, 2561, 2521, 2451, 2427, 2478, 2467, 2461, 2479, 2513, and 2455 when discharged at .5A on my Opus 3100.

HKJ’s test results also show them to exceed Fujitsu’s claim unlike the AAA’s.

This was not a judgemental question, but a literal one. I do not see a 3600mAh figure in the Panasonic cell wrap, for example.

Another example: LG states in their M36 datasheet 3.63V average voltage and 12.5/12.1Wh typical/minimum energy. This is 3444/3333mAh typical/minimum capacity down to 2.5V, but the cell neither meets typical nor minimum rating even if it were to be discharged that low, I see it by my integrating eye LoL. Thus, 3600mAh?

If I am to sell something I deeply believe in claiming actual figures which my product can meet or surpass at the hands of my customers. This carves out trustworthiness and peace of mind.

Cheers ^:)

My search for capacity goes:

  1. The wrapper
  2. The datasheet
  3. The internet

I first measure the capacity long after I have named the cell.

Even I see for mobile phone batteries, I have a Samsung Galaxy S9 Plus equipped with a battery that is officially 3500mAh and when I use the battery manager “AccuBattery” (very good software fairly accurate) that installed as soon as I bought the phone so new, based on the first 10 complete cycle of charge/discharge, the battery did not exceed 3420mAh according to his estimate, so there is always a gap between what is written on the paper and reality.