• Howdy! we're looking for donations to finish custom knowledgebase software for this forum. Please see our Funding drive thread

SANYO UR14500P AA-size Li-ion battery's capacity test


100 W
Oct 8, 2017
Original article: https://www.thunderheartreviews.com/2019/04/sanyo-ur14500p-aa-size-li-ion-battery.html

14500 is the same AA size we used to see in alkaline and Ni-MH batteries. It assumes 50mm in length and 14mm in diameter. Previously i've tested SONY US14500VR2 and TrustFire 900mAh and Sanyo UR14500P is the third cell in this format i tested. It's a 840mAh rated low-drain cell without protection PCB.

The battery was bought from my reliable supplier (Queen Battery) and tested with ZKETECH EBC-A20 and a self-made battery holder. It's a PC-connected battery tester supporting 4-wire measuring and discharging at up to 20A.

I've used version 3.0 of my battery holder based on 0.5mm thick pure copper terminals


I've followed all the prescriptions of the IEC61960-2003 standard concerning battery's capacity measurement. Before each discharging cycle each battery was charged at standard charge current mentioned in its datasheet to charge end voltage. Before each discharging or charging i've held a 1-1.5hrs pause. The environment temperature was 23.0-24.5°C. To be sure in results i've done each test minimum twice (usually 3-4 times).


The cell is marked as SANYO L UR14500P V08B. As Sanyo usually does, the marking is hardly readable and you should find the right angle under which you'll be able to read the marking.

Specifications from UR14500P datasheet:
Rated capacity: 800mAh at 20°C
Minimum capacity: 800mAh at 25°C
Typical capacity: 840mAh at 25°C
Nominal voltage: 3.7V
Standard charge current: 0.56A (0.7C)
Max charge current: 800mA (1C)
Charge end voltage: 4.20V
Charge cut-off current: 16mA (0.02C) (100mA used)
Max continuous discharge current: 1.6A (2C)
Discharge cut-off voltage: 2.5V
Max weight: 21.0g

The measured weight of my cell is 19.31g. Measured DCIR at 800mAh was 57.5±5mΩ (in fully charged condition).

Capacity test results:

At 0.2C or 0.16A UR14500P's capacity is noticeably higher than declared in the datasheet - 868mAh. A its max discharge rate this little red cell gave out almost 750mAh. Curves look excellent.

For low drain applications UR14500P could be a good choice, especially where small sized cells are needed.

Here is the video version of this review

Check out my YouTube channel for batteries, chargers and other stuff reviews.
I've launched my blog where you can find all my reviews in one place. Every new test/review will be first published on YouTube and in the blog. I'll be happy to see new subscribers, comments, suggestions and just your thoughts.