How to charge lithium battery

I have the opportunity to obtain a lithium battery that was used in a helicopter at the right price ,if i can use it.

Apparently these batteries are routinely replaced early in their life as a safety precaution.

It is apparently approx 100 to 150 amp but 24 volt.

Can i step up charging voltage from 12v to 24v from a vehicle alternater and then draw 12v to run a fridge and some led lights ??

I am famililiar with wireing solar and multiple batteries in 12v as isxusually done. But have no knowledge of this setup.

Thankyou for any thoughts and advice.
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Reply By: Member - Boobook - Sunday, Jul 26, 2020 at 18:08

Sunday, Jul 26, 2020 at 18:08
You can do it but it will be expensive, not too efficient and restrictive. Then when you need a new battery you probably have to start again. I would not recommend it.

https://www.outbackmarine.com.au/pro-charge-b-series-12-24-volt-dc-to-dc-battery-ch


https://www.outbackmarine.com.au/power-conversion/dc-dc-converters/non-isolated-dc-dc-converters/



AnswerID: 632704

Reply By: RMD - Sunday, Jul 26, 2020 at 18:36

Sunday, Jul 26, 2020 at 18:36
Depending on what the right price actually is and buying buck boost charger and stepdown voltage/current module off the internet, you are still going to be spending near the cost of a 12v lithium unit anyway. No easy way. Check the need carefully!
AnswerID: 632705

Reply By: Pepper - Sunday, Jul 26, 2020 at 19:07

Sunday, Jul 26, 2020 at 19:07
Thankyou for both replies....the right price is zero ..

You are correct simpler and cheaper to buy a 100 amp agm

Was just hoping to be able to use these aircraft batteries that are still working fine for my intended use rather than seeing them being thrown away when there is still life in them..

Sorry i grew up with no money and the training that you repaired and reused everything..
AnswerID: 632706

Follow Up By: RMD - Sunday, Jul 26, 2020 at 19:21

Sunday, Jul 26, 2020 at 19:21
If for free, then look at the net/eBay for step up voltage charger systems AND voltage reducers at the required current for the fridge. For under $100 you should be able to find something to pass the time. Some step up units from solar input are actually MPPT units which can be set to be ok for lithium. A bit of understanding required of course.
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FollowupID: 909556

Follow Up By: Alloy c/t - Monday, Jul 27, 2020 at 09:53

Monday, Jul 27, 2020 at 09:53
If your fridge is a Engle 24v should not be a problem ? Or have they changed ? My old [17yrs never missed a beat ] 15 lt works on 12v in the FJ Cruiser, 24V in the Truck and then 240v in the shed .....
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FollowupID: 909565

Reply By: Pepper - Sunday, Jul 26, 2020 at 19:30

Sunday, Jul 26, 2020 at 19:30
Thankyou for your reply.
AnswerID: 632707

Reply By: Allan B (Sunshine Coast) - Sunday, Jul 26, 2020 at 20:00

Sunday, Jul 26, 2020 at 20:00
.
Pepper, Lithium ion batteries are typically composed of eight cells in series to produce 24 volts. You may be able to rework the 24v battery to produce two batteries of 12 volts each. However, it is not just a simple matter of "cutting" the battery in half...... there are some considerations to be made.
You would need to obtain the assistance of someone who understands these batteries.


Cheers
Allan

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AnswerID: 632709

Follow Up By: Member - McLaren3030 - Monday, Jul 27, 2020 at 14:07

Monday, Jul 27, 2020 at 14:07
Begs the question, are they Lithium Ion, or Lithium Iron Phosphate? Different charging system required for each. If I am correct.

Macca.
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FollowupID: 909575

Reply By: Member - abqaiq - Monday, Jul 27, 2020 at 16:33

Monday, Jul 27, 2020 at 16:33
Check that the battery is a Lithium IRON phosphate. Aircraft may use a Lithium COBALT or other metal. Cobalt batteries have much higher energy density than the Iron versions so they are more compact and lighter than Iron batteries but can suffer catastrophic runaway reactions and effectively unstoppable fires. Early Boeing 777s suffered several fires due to runaway Lithium Cobalt batteries! NOT ALL SAME SAME
AnswerID: 632726

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