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LiFePo vs Ultrafire vs Efest IMR

has anyone tested these?

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#1 ravetrooper

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Posted 30 May 2015 - 11:45 AM

Found some of these 14500 size batteries I hadn't seen before:
http://pages.ebay.co...5647735&alt=web

They look like a great deal, but before buying some I thought I'd ask here if anyone has had experience with them. How do they compare to LiIon batteries like IMRs or Ultrafires? I would be running these in a resistor/lock free stryfe circuit with the stock motors. I've been using ultrafires in all my stryfe mods before now, and they've worked just fine for me. These LiFePo batteries, however, look to be cheaper and they come from the US. Thanks for the help!

~Rave
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Gut the electronics, drill a hole in the shell, and attach a crank to the gear. Bam, crank-action stampede that doesn't require batteries, or even a trigger.

...(also judging by your past posts, I would consider you pretty dang wise elder like in the modding community :lol: )


#2 Lunas

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Posted 30 May 2015 - 12:23 PM

Found some of these 14500 size batteries I hadn't seen before:
http://pages.ebay.co...5647735&alt=web

They look like a great deal, but before buying some I thought I'd ask here if anyone has had experience with them. How do they compare to LiIon batteries like IMRs or Ultrafires? I would be running these in a resistor/lock free stryfe circuit with the stock motors. I've been using ultrafires in all my stryfe mods before now, and they've worked just fine for me. These LiFePo batteries, however, look to be cheaper and they come from the US. Thanks for the help!

~Rave

not so fast

those from what i can find are likely only rated to 2C so 1.4 AMP if the 700 mAh is correct. Lifepo4 is a more durable chemistry and frequently found to be able to do up to 30C. however i will now throw back these are cheap Chinese cells i know everything i made there these days but the 700mAh is definitely exagerated it is likely closer to 450-550mAh in which case it is only good for 1.1 Amp discharge and being they are meant for solar lights i would think this is most likely the case. If these were unprotected cells and they could do 30C that is still only ~15 Amps if it is indeed 500 mAh if it actually is 700 and a bare unprotected cell and can do 30C your looking at 21 Amps.

That is also assuming these are indeed lifepo4 cells there is a story about some knock off tenergy lifepo4 exploding inside a flashlight while the owner was holding it in his mouth working on his truck. The knock offs were never found so it could never be determined definitively but it was believed they were actually li-ion. Not much was left of the flashlight body either. What set those off was believed to be thermal shock.


So i guess what im trying to tell you is don't take your life in the hands of cheap batteries... these also require a compatible charger li-ion chargers are not all compatible... and just because the seller is in the US does not mean they are not made overseas (they say made in CHINA on the side)


Efest IMR v2 Li-Mn 3.7-4.2v 9.7 Amp discharge rate safer chemistry limited medium capacity more expensive than li-ion
Ultrafire Li-Ion 3.7v-4.2v 2-3A discharge unsafe delicate chemistry Highest capacity cheapest
Lifepo4 3.3v 1a-21A typical discharge safest chemistry and most expensive lowest capacity

Imr is Lithium manganese chemistry abbreviated Li-Mn
Ultrafires are li-ion which are lithium cobalt
Lifepo4 are lithium iron phosphate

Edited by Lunas, 30 May 2015 - 12:39 PM.

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#3 ravetrooper

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Posted 30 May 2015 - 12:51 PM

Thanks! Good to know :)
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Gut the electronics, drill a hole in the shell, and attach a crank to the gear. Bam, crank-action stampede that doesn't require batteries, or even a trigger.

...(also judging by your past posts, I would consider you pretty dang wise elder like in the modding community :lol: )



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