HKJ
(HKJ)
August 2, 2021, 9:42am
1
E-Stream ES18650-29MP 2900mAh (Green) 2021
Official specifications:
Capacity Nominal: 2900mAh
Capacity Minimum: 2750mAh
Nominal Voltage: 3.7V
Discharge cut-off voltage: 2.75
Maximum charge voltage: 4.2V
Intern impedance: <=28mOhm
Standard charge current: 1.425A
Standard charge cut-off current: 142.5mA
Maximum continuous charge current: 2.9A
Maximum pulse charge (<2s): 5.7A
Standard discharge current: 2.85A
Maximum continuous discharge current: 10A (With 60°C cut-off)
Maximum pulse (<1s) discharge current: 15A (With 60°C cut-off)
Cycle life: 1000 cycles to 80%
A 2900mAh LiIon battery with moderate current rating.
The two cells is fairly well matched and the cells can deliver the rated 10A
Conclusion
The batteries looks fine, they do not set any records in either capacity or current, but are more average.
Notes and links
The batteries was supplied by E-Stream 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
Graphical comparison to 18650 and other batteries
Table with all tested LiIon batteries
Thanks for your review. Would only buy these cells if their price was below average.
Oli
(Oli)
August 2, 2021, 5:49pm
3
spec…
1000 cycle life…
2.9 amp charging…
Those two numbers are way above average. They are claiming the charging rate is above the standard discharge rate.?
HKJ
(HKJ)
August 2, 2021, 7:32pm
4
A maximum charge rate of 1C is nothing special. The 1000 cycles is higher than the usually 400-500 cycles.
How believable is that claim from a fairly no-name manufacturer?
IIRC Panasonic has some 3000 cycle rated cells, however they have very interesting discharge/charge specifications (e.g. charging termination voltage is just 4.05V or something weird like that).
Oli
(Oli)
August 3, 2021, 1:55am
7
Ok 30Q as a Max charge rate of 4 amps so yeah 2.9a is nothing special for a 3000mha 18650
HKJ
(HKJ)
August 3, 2021, 7:57am
8
How believable is that claim from a fairly no-name manufacturer?
IIRC Panasonic has some 3000 cycle rated cells, however they have very interesting discharge/charge specifications (e.g. charging termination voltage is just 4.05V or something weird like that).
You (and I) do not know who manufactured the battery. The reduced performance may be due to the higher charge cycle count, but that is just a random guess.
How are max cycles assessed? If I am not mistaken cycle life will improve significantly if a battery is not fully (dis)charged, e.g. 3.50V - 4.10V.
HKJ
(HKJ)
August 3, 2021, 8:25am
10
If nothing is specified it is usually using standard charge and discharge, the data sheet for this cell do specify that is the case.