Test / Review: Efest IMR10440 V1 350mAh (Black)

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HKJ
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Test / Review: Efest IMR10440 V1 350mAh (Black)

Efest IMR10440 V1 350mAh (Black)


DSC_0557

Official specifications:

  • Brand /model: Efest IMR 10440 350mAh 3.7V
  • spec: LiMn 10440 350mAh 3.7V
  • Material: IMR(LiMn)


Efest%20IMR10440%20V1%20350mAh%20(Black)-info

Internal resistance is calculated from 1A to 2A.

DSC_0513 DSC_0556

I got a pile of batteries in one envelope, not the best way to ship batteries, even when they are shrink wrapped. Efest have changed their packing.

DSC_0558 DSC_0559

DSC_0560
DSC_0561

Efest%20IMR10440%20V1%20350mAh%20(Black)-Capacity

1A is handled very well, but even 3A is possible with these IMR cells.

Efest%20IMR10440%20V1%20350mAh%20(Black)-CapacityTimeHours

Efest%20IMR10440%20V1%20350mAh%20(Black)-CapacityTime

Efest%20IMR10440%20V1%20350mAh%20(Black)-Energy

Efest%20IMR10440%20V1%20350mAh%20(Black)-PowerLoadTime

Efest%20IMR10440%20V1%20350mAh%20(Black)-TripCurrent

Thse IMR batteries handles a high load for their size.

Efest%20IMR10440%20V1%20350mAh%20(Black)-Charge



Conclusion

These IMR batteries have very good performance at high loads, but the capacity is, of course, not that high.
At the current time I can only rate them acceptable, because Efest is a new company, and the batteries is not from one of the big brands.



Notes and links

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
Comparison to other LiIon batteries

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Edited by: sb56637 on 08/26/2014 - 17:45
Rufusbduck
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Thanks for the test. I have a pair of these waiting for light(s) in which to use them.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott

kreisler
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Thanks for the review!!

I like 10440's Smile

*FMI* i got 4 i/o sh
scaru
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Any chance of 5 amp loads?

HKJ
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scaru wrote:
Any chance of 5 amp loads?

I do not believe there is any point in a 5A test, look at the difference between 2A and 3A, the difference between 3A and 5A is going to be larger.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

scaru
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HKJ, do you have any suggestions for a IMR battery (18650) that could supply 20+ amps and still have enough of a voltage to power an XM-L?

NightCrawl
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lol scaru, you are cheap! I ordered 5 different IMRs (2pc of each) to get them tested. Silly

HKJ
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scaru wrote:

HKJ, do you have any suggestions for a IMR battery (18650) that could supply 20+ amps and still have enough of a voltage to power an XM-L?

 

The only 18650 I have tested at 20A is the AW IMR 18650 (Except A123, but they are lower in voltage).

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

scaru
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NightCrawl wrote:

lol scaru, you are cheap! I ordered 5 different IMRs (2pc of each) to get them tested. Silly

Well, when I am already paying for 7 XM-Ls I need to save some money. Wink And you don't need that much power, you only need 12 amps. Wink

HKJ
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scaru wrote:

Well, when I am already paying for 7 XM-Ls I need to save some money. Wink And you don't need that much power, you only need 12 amps. ;)

 

For 10A you can use this chart:

And then also check my protection test that goes to 15A.

I am going to add some Efest IMR cells to the chart soon.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

NightCrawl
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scaru wrote:

NightCrawl wrote:

lol scaru, you are cheap! I ordered 5 different IMRs (2pc of each) to get them tested. Silly

Well, when I am already paying for 7 XM-Ls I need to save some money. Wink And you don't need that much power, you only need 12 amps. Wink

You know nothing about my needs! Big Smile

scaru
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NightCrawl wrote:

scaru wrote:

NightCrawl wrote:

lol scaru, you are cheap! I ordered 5 different IMRs (2pc of each) to get them tested. Silly

Well, when I am already paying for 7 XM-Ls I need to save some money. Wink And you don't need that much power, you only need 12 amps. Wink

You know nothing about my needs! Big Smile

Triple MTG-2? Evil

NightCrawl
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Great idea, but I want my lights to be useful. I'm no multicell guy.. did I say useful? Big Smile

texaspyro
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scaru wrote:
Well, when I am already paying for 7 XM-Ls I need to save some money.

Do it right… dump’em and use XML2’s…

sb56637
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Thanks very much! Frontpage’d and Sticky’d.

Budget Light Forum ...where Frugal meets with Flashlight!

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A few low current chargers for 10440s: XTAR XP1 (250mA), Micro Lipo mcp73831 (100mA / 500mA, default 100mA), LipoNano (100mA / 500mA, default 500mA). Lipo nano / mcp73831 test. You can even connect an AAA battery holder to the micro lipo without soldering (twist & tape).

Modding a $1.50 tp4056 charger board would be the least expensive option. A 5.1k resistor gives 250mA, 10k for 130mA. A through hole resistor works or a 0805 resistor. Original resistor is 0603 but 0805 does fit on the pads. FT $1.56 0805 3.9K-62K Resistor pack 270-Piece

With efest10440 250mA is 0.81C, 150mA is 0.49C. LiMn might be able to tolerate more but don’t want to risk losing any capacity from charging too quick.


Counterfeit 18650s, 2,<a href=“http://

koyotee
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So is the 250ma option good for these batteries?

Finaly, proud owner of a Powerex Maha mh c-9000 for my Eneloops:)

HKJ
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koyotee wrote:
So is the 250ma option good for these batteries?

Yes, 250mA charge current is fine for 10440

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

koyotee
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Thanks! Smile

Finaly, proud owner of a Powerex Maha mh c-9000 for my Eneloops:)

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i see that in the protection test, you run the batteries
down to below 2 volts and sometimes below 1.75 volts.

these batteries have no protection circuit.

Is this safe to do with this chemistry.?
can i run these without protection until dead
and then recharge ?

thanks for the great info

HKJ
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B25364 wrote:
i see that in the protection test, you run the batteries down to below 2 volts and sometimes below 1.75 volts. these batteries have no protection circuit. Is this safe to do with this chemistry.? can i run these without protection until dead and then recharge ? thanks for the great info

I am only below 2 volt for about 2 seconds and then at a high load. The batteries are not discharger below 2 volt.

No, you will damage the batteries if you run them below 2 volt and probably also below 2.5 volt.

My website with reviews of many chargers and batteries (More than 1000): https://lygte-info.dk/

Halo...
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200mA is good.

Halo...
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Does the bt-c3100 do pulse charging?

I don’t like pulse personally.

Rufusbduck
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Xstar MC-0 does ok at 250 mA but it’s not too hard to mod a tp4056 board to even lower charge current.

Three Tanna leaves to give him life, nine to give him movement. But what if he eats the whole bag?

Scott