Test/Review of EagleTac 18650 3400mAh (White-green)

[size=+3]EagleTac 18650 3400mAh (White-green)[/size]



Official specifications:

• Made in Japan battery cells
• 304 Stainless steel button top
• High current load of up to 5A
• IC protected against short, over-discharge, over-charge
• Measures only 68mm in height
• Steel plate reinfocred bottom
• Ultra high capacity and high voltage even under heavy loading
• Voltage: Typical 3.7V (4.2V when fully charged)
• Capacity: 3400mAh (discharged at 0.2C)
• Dimensions: 18.6mm x 68mm (+/-0.1mm)
• Weight: 50gram

This is the latest cells from Panasonic with the highest capacity.
The cell used can be discharged down to 2.5 volt, in my test I only discharges to 2.8 volt, i.e. I do not measure the full capacity. But then, not all lights will be able to use the full capacity.











The two batteries does track nicely, due to the protection circuit the battery has slightly lower output voltage at high current.















[size=+3]Conclusion[/size]

This is a very good battery.
Like the EagleTac 3100 battery, this battery is very short for a protected battery, this can be useful sometimes.



[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

Thanks a lot for your excellent test review always. HKJ! :thumbsup:

Many manufacturers release good high capacity protected 18650 li-ion cells.

I'm just glad there are so many 3400 mAh that are testing well!

candle lamp said:

Many manufacturers release good high capacity protected 18650 li-ion cells.

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That is true, just about all batteries based on the Panasonic cells are "very good".

climberkid said:

I'm just glad there are so many 3400 mAh that are testing well!

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But there are differences, the length varies between manufactures and there is also differences in the protection circuit, both at what current it trips and in the resistance (Compare the voltage in the 5A current trace).
Generally a battery with very high current limit will have slightly lower resistance in the protection circuit, but the risk of damaging the battery is higher, because you can draw much higher current than the battery is designed for.

Is there a more/less agreed upon standard as to the capacity, in watt*hours, or a cr123A?
So, this 18650 has the stored energy of 3 cr123As

Thanks for this. Eagletacs have become a staple for me and I appreciate having the reviews up in such a timely manner! They are a lifesaver!

MichaelW said:

Is there a more/less agreed upon standard as to the capacity, in watt*hours, or a cr123A?
So, this 18650 has the stored energy of 3 cr123As

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There are standards for measuring capacity, but I am not using them. I prefer to test with a couple of different loads.

The energy of a CR123 will depend on the current draw, at low current it might be around 4 watt, but at higher load will drop to below 3 watt.
Compared to this a high capacity 18650 can have 3 times the energy of a CR123 in about 2.5 times the space. But remember that the voltage is different.

Good. Now I don't have to regret recommending these.
Thanks for the review!

Can these cells be used reliably in series? I'm not able to see from the pictures if the button top is protruding enough to make good contact.

thanks for review HKJ, glad there are shorter 3400mah batteries out there.

Lurveleven said:

Can these cells be used reliably in series? I'm not able to see from the pictures if the button top is protruding enough to make good contact.

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It is a very short button top, but they can be used in series.

Thanks, then I think these may be the safest cells to buy since they will probably fit more lights than the other 3400 mAh cells.

I have a question. If this cell is using the Panasonic 3400 and the KeepPower is using the same Panasonic 3400 then why is this labeled at 3.7V and the KeepPower labeled at 3.6V?

Verndog said:

I have a question. If this cell is using the Panasonic 3400 and the KeepPower is using the same Panasonic 3400 then why is this labeled at 3.7V and the KeepPower labeled at 3.6V?

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The Panasonic datasheet says 3.6 volt.
The guy making the labelling was probably just writing the value used for other LiIon cells, without checking the datasheet for this cell.

Lurveleven said:

Can these cells be used reliably in series? I'm not able to see from the pictures if the button top is protruding enough to make good contact.

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The top of mine is pushed in from using it in a Spark SD6. I doubt I could use this cell in serries. It could even be a problem charging depending on the charger.

HKJ said:

The Panasonic datasheet says 3.6 volt.
The guy making the labelling was probably just writing the value used for other LiIon cells, without checking the datasheet for this cell.

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So you are convinced they use the exact same cell, and there is no chance slightly different versions may be out there?

jeffkruse said:

The top of mine is pushed in from using it in a Spark SD6. I doubt I could use this cell in serries. It could even be a problem charging depending on the charger.

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The top of mine is pushed also from a shiningbeam s-mini, there is no way it could be used in series.

I'm new to the 18650 battery, where are you guys purchasing them? Does anyone know if the 3400 EagleTac will fit in a Sunwayman V20C?

Just curious. If I removed the Eagletac wrapper and PCB, would I be left with the basic green NCR18650B, or does Eagletac (and others) originally purchase something even more bare to wrap?

markr6 said:

Just curious. If I removed the Eagletac wrapper and PCB, would I be left with the basic green NCR18650B, or does Eagletac (and others) originally purchase something even more bare to wrap?

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I do not know if they purchase it without wrapper or remove it them self, but some manufactures uses the cell without the green wrapper. This makes the diameter of the final battery a bit smaller.