Test/Review of Sanyo/Panasonic UR18650NSX 2600mAh (Red)

Sanyo/Panasonic UR18650NSX 2600mAh (Red)

Official specifications:

  • Typical capacity: 2600mAh

  • Minimum capacity: 2500mAh

  • Nominal voltage: 3.6V

  • Standard discharge: CC/CV, 0.2C, 3V

  • End-of-charge voltage: 4.2V +/0.05V

  • End-of-charge current: 0.02C (50mA)

  • End-of-discharge voltage: 2.5V

  • Continuous maximum charge current: 1C, 2500mA

  • Maximum pulse charge current: 1C, 2500mA

  • Continuous maximum discharge current: 20000mA 7.5C or 22000mA 8.5C with temperature cut-off at 80°C)

  • Max discharge current vs. time: 25-30A > 30second, 35A > 15seconds, 50A -> 6seconds

  • Cycle life at 0.5C: 300 cycles to 80%

  • Initial impedance: 35mOhm

  • Weight: 45.5g +/- 0.03g

  • Operating temperature: Charging: 0°C ~ 45°C, discharging –20°C ~ 60°C

  • Storage temperature: –20°C ~ 40°C (Max. 3 months)

A high current cell with decent capacity cell from Sanyo.

The discharge curves looks very good, the cells tracks nicely and the capacity is nearly constant up to 20A.
The 30A curve is outside specifications, but the cell handles it nicely.

The cells gets warm, but not anywhere near the temperature limit. One of the cells reach 82°C after I have stopped discharge.


This battery is a very good battery with good high current performance, capacity is in the mid range.

Notes and links

The batteries was supplied by ENERDan for review.

How is the test done and how to read the charts
How is a protected LiIon battery constructed
More about button top and flat top batteries
Compare to 18650 and other batteries

Thanks for the review HKJ.

Thanks for the test!

Nice! Never seen a high specific power battery from Sanyo before.

Seems another nice tool for vapers and you crazy FET drivers.

By the way, how are the LiitoKala 26650-50As standing in the review queue now HKJ? :-D

Thanks a boatload sir.

Cheers ^:)

It is not even in the queue, I do still have many batteries in queue and I received some more today.

Wondering how it compares to the 25Rs when it comes to medium current (6-15Amps). Sadly it’s hard to compare since the 25Rs were tested with the old rig. Also, wondering about cycle life, my 25Rs are 1.5 years old and with usage around 5-15Amps they still hold up pretty well after at least 250 cycles.

Cycle life on this cell is 300 to 80% but you know the life cycle is usually rated on the cells max charge and discharge rate. Most people arnt going to charge their batteries at 2-4 amps and discharge at 20 amps constantly every cycle. And the drop from 80% to 70 percent takes a long time. To anseer your question though. Mid drain would probably be exactly the same this cell is rated to 22 continuous not much lower then the 25r. Probably wouldn’t notice any difference in them. Given the same age cycles etc

Take the Panasonic NCR 18650b the chart from Panasonic shows 500 cycles to 80% but from 80% to 70% capacity takes another 2000 cycles. Google Panasonic NCR b life cycle chart. It will pop up.

If they could make a battery years ago that cab get 2500+ cycles to 70% they could make better batteries today. And thats full cycles the teslas dont charge abd dischsrge fully snd years lster with thesr panasonic bstteries no signaificant capacity loss has been reported. But they’d lose billions. They want to sell batteries yearly for sales not once a decade. Rumor has it the next generation made with mostly silicone can take thousands of cycles. But that’s bad for manufactures