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Batteries & Chargers Discuss Li-P, Li-Ion, NiMh, Nicad battery technology and the chargers that juice 'em up!

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Old 07-31-2012, 09:21 PM   #1
puzzlegb
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Default help..DA 50 crash on lifepo min volt???

just crash my 26% not knowing the min, voltage for a lifepo 2s 2100ma
after 2 days of flying i check the voltage of each batt ( I have 2, the rx is build for that purpose) It read 6.23v and when on a 2 amp load it still gave me 5.8v so I deducted that since my rx is good until 4v no problem, wrong...
from what I can see from a nominal 6.6v when the batt reach 6.2v it's pretty well empty ??
back home I tried to discharge the batt. my Icharger said the voltage was too low then it took the full charge.
I appreciate your comment.

puzzlegb
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Old 07-31-2012, 09:57 PM   #2
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Originally Posted by puzzlegb View Post
just crash my 26% not knowing the min, voltage for a lifepo 2s 2100ma
after 2 days of flying i check the voltage of each batt ( I have 2, the rx is build for that purpose) It read 6.23v and when on a 2 amp load it still gave me 5.8v so I deducted that since my rx is good until 4v no problem, wrong...
from what I can see from a nominal 6.6v when the batt reach 6.2v it's pretty well empty ??
back home I tried to discharge the batt. my Icharger said the voltage was too low then it took the full charge.
I appreciate your comment.

puzzlegb
LiFe cells ROCK - but you found one thing that is good and bad. They maintain voltage wonderfully. They are happy to do that - until the end where they dump voltage VERY quickly as you tragically found out.

6.2v is done for sure.

Since the voltage dump is so steep here is what I recommend. Do one flight - recharge - see how much you use. Do two flights recharge and see how much it takes to fill the pack. With LiFe I recharge at 60-70% capacity gone even though they are pretty safe to 80% discharge. I am gun shy as I know at the end they dump without warning.

You just can't tell how flat they by applying a load like NiCad cells. They simply produce excellent voltage until the end and then they dump in seconds.

Sorry for your loss.

Mike
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Old 08-01-2012, 03:22 AM   #3
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thank's Mike, i guess i got cauth up by the numbers, even the guy that sold it to me did not know.
from past refill, I should have knowed, the trap was set and I did'nt look hard enough..
I find it hard to trust them any more even though they take a full charge..
thinking to going back to nimh..at least I can put a 2A load and see..
thank again..
Gilles.(jil)
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