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Can I substitute 18650 Lions for Lifepo4?

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#1 calypsob

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Posted 18 September 2021 - 01:31 PM

I was in the process of buying a second dew heating solution for my grab n go imaging rig.  I saw this box https://www.amazon.c...op?ie=UTF8&th=1 which can hold 6 x 18650 batteries

 

Its made for lithium ions but I noticed while shopping around that you can also get 18650 lifepo4's  https://stortronics....ifepo4-battery/   Would it hurt anything to swap out the LIFEpo4's instead of lithium ions?

 

I plan on using the 8.4v cable and adding a 5v reducer with a usb splitter.  I will likely charge the batteries externally on a charger designed to keep them balanced.  

 

Seems like a cool way to utilize a battery that is superior in performance to a lion 


Edited by calypsob, 18 September 2021 - 01:32 PM.


#2 calypsob

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Posted 19 September 2021 - 01:39 PM

Nothing? surely someone knows a bit about these types of batteries 



#3 Oort Cloud

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Posted 19 September 2021 - 03:31 PM

Not off the top, but whenever I have questions about baterry chemistries, I always go to the same place...

https://batteryuniversity.com/

Great resource, tons of good info over there.
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#4 tosjduenfs

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Posted 20 September 2021 - 06:04 AM

The listing does specify to use protected Li-ion cells. Likely because this device does not offer any undervoltage protection on a cell level and over-discharging will degrade/destroy a cell . That said it would probably work with caveats. Li-ion is 3.7v nominal and LifePo4 is 3.2v nominal. If the buck converter has a low voltage cutoff around 3v per cell then LifePo4 batteries won't be able to fully discharge, leaving capacity on the table. Your best bet is to just use Li-ion especially considering the capacity of the cells you've linked, it is horrendously low. LifePo4 is generally safer if a failure occurs but not necessarily superior density wise, if you can take care of your cells then just get the Li-ion.

Edited by tosjduenfs, 20 September 2021 - 07:20 AM.

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#5 calypsob

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Posted 20 September 2021 - 12:20 PM

The listing does specify to use protected Li-ion cells. Likely because this device does not offer any undervoltage protection on a cell level and over-discharging will degrade/destroy a cell . That said it would probably work with caveats. Li-ion is 3.7v nominal and LifePo4 is 3.2v nominal. If the buck converter has a low voltage cutoff around 3v per cell then LifePo4 batteries won't be able to fully discharge, leaving capacity on the table. Your best bet is to just use Li-ion especially considering the capacity of the cells you've linked, it is horrendously low. LifePo4 is generally safer if a failure occurs but not necessarily superior density wise, if you can take care of your cells then just get the Li-ion.

Perfect, Thats exactly what I wanted to know. Thanks


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