Test/review of A123 ANR26650M1B 2500mAh (Green)

Batteries and Chargers Rechargeable Batteries
1

A123 ANR26650M1B 2500mAh (Green)







Official specifications:

  • Nominal capacity: 2500mAh

  • Minimum capacity: 2400mAh

  • Call weight: 76g

  • Internal impedance: 6mOhm @ 1kHz

  • Recommended standard charge method: 1C (2.5A) to 3.6V CCCV, 45 min

  • Recommended fast charge method: 4C (10A) to 3.6V CCCV, 12min

  • Maximum continuous discharge: 70A

  • Maximum pulse discharge: 120A for 10s

  • Cycle life: >1000 cycles

  • Operating temperature: –30° ~ 55°C

  • Storage temperature: –40°C ~ 60°C



This cell is fairly old, data sheet is from 2011, but even today its current capabilities are impressive. The capacity is not very impressive, but some of it is related to the chemistry (LiFePO4), it has lower capacity.





Watch out for polarity on this cell, the can is plus!







This chemistry has a very flat discharge curve and the two cells are well matches and do not have any problems with 30A





The do not even get hot.















Conclusion

These are impressive high current battery. The disadvantage of these batteries is lower voltage and capacity. Today it is possible to get better batteries in this chemistry.



Notes and links

Vapcell told me that I was missing some cells in my comparator and they would be happy to supply them.

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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
2

Sorry but there's something wrong with this test: the reviewed cells were bad, for sure.

You already reviewed this cell in the past with the old station, dear Henrik: A123 26650 2500mAh (Green)

Let's take a comparative look at the discharge graphs:

From this review:

From the old review in the old, non 4 terminal (?) holder station:

The difference is appalling!

Mooch also reviewed this cell 2¾ years ago: A123 ANR26650M1-B 2400mAh 3.3V 26650 Bench Test Results...an extraordinary battery, with issues

His main discharge graph:

Regards and cheers :-)

3

The cell may be a bit old, I do not see any other reason for this.

4

It’s a shame A123Systems went out of business. Their LiFePO4 cells were quite ahead of their time.

5

A few years ago when I asked someone at A123, I was told all the cells then on the market were old stock but that the company planned to resume production.

6

Impressive current indeed, although at a low voltage.

If those cells are as old as their datasheet…

7

Yeah ,It is old a123 cell, HKJ，could you mark old cell，or The title says old M1B

Battery curves are compared with M1B,

https://lygte-info.dk/review/batteries2012/A123%2026650%202500mAh%20(Green)%20UK.html

This battery is very good :+1: