Test/Review of A123 26650 2500mAh (Green)

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
[SIZE=+3]A123 26650 2500mAh (Green)[/SIZE]

DSC_0049.jpg


This is a battery that can deliver very high amount of power!

Official specifications:
  • Nominal Voltage: 3.3v
  • Nominal Capacity: 2.3A
  • Standard Charge: 3.6A
  • Max Charge: 10C
  • Max Allowable Charge Voltage: 4.2v Charge voltage is 3.6 volt
  • Max Discharge: 30C (Continuous)
  • Burst Discharge: 60C
  • Weight: 70g
  • Dimensions: 66.5mm x 26mm


The above current rating is much lower than the A123 datasheet is says: 70A continuous and 120A pulse.

A123%2026650%202500mAh%20%28Green%29-info.png


This battery is rated for 2500mAh (in A123 datasheet) and will deliver it, even at a 30A load, but the voltage is lower than the normal LiCoO2 batteries.

DSC_0047.jpg


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DSC_0050.jpg


On this battery the body is the plus connection.

DSC_0052.jpg

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A123%2026650%202500mAh%20%28Green%29-Capacity.png


Same capacity at any load and very constant voltage during discharge, but the price for the high current ability is capacity.

A123%2026650%202500mAh%20%28Green%29-CapacityTimeHours.png


A123%2026650%202500mAh%20%28Green%29-CapacityTime.png


A123%2026650%202500mAh%20%28Green%29-Energy.png


A123%2026650%202500mAh%20%28Green%29-PowerLoadTime.png


A123%2026650%202500mAh%20%28Green%29-TripCurrent.png


A123%2026650%202500mAh%20%28Green%29-Charge.png


I have used the same 1A charging current as I do for most other batteries. This battery is designed for much faster charging, recommend charge current is 2.5A and max. charge current is 10A for a 12 minutes charge to 80% capacity.


[SIZE=+3]Conclusion[/SIZE]

This battery uses a "safe" chemistry, but this does not make the battery safe, any battery that can deliver 120A has to be very careful treated.
This is a very interesting battery for some applications, but due to the low voltage it is not really good for flashlights (leds need a lower Vf).
This battery can only rate as very good.



[SIZE=+3]Notes and links[/SIZE]

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
 
Last edited:

lwknight

Enlightened
Joined
Feb 29, 2012
Messages
312
Location
North Texas
That is more like a capacitor than a battery.
What kind of device would require such power burst other than a
restarting battery for a long range drone aircraft?
 

HKJ

Flashaholic
Joined
Mar 26, 2008
Messages
9,715
Location
Copenhagen, Denmark
That is more like a capacitor than a battery.
What kind of device would require such power burst other than a
restarting battery for a long range drone aircraft?

A123 is selling batteries for electric vehicles, power tools and even storage for the power grid.

For more hobby related stuff this battery can be used in RC planes.
 

mjgsxr

Enlightened
Joined
Feb 17, 2013
Messages
385
Location
N Ireland
Does anyone know if there's a date of manufacture code on these A123 cells and how to read it ?
 
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