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Home✈️Aircraft🚁HelicopterBeginners Corner › How do you know when a li-po battery pack is charged?
09-10-2006 06:05 AM  14 years ago
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jwpjr

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Tampa, FL USA

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How do you know when a li-po battery pack is charged?
I'm still struggling with a couple of li-po battery packs. How do you determine the status of the charge on a pack. I am using two 5s2p's in series but I really can't tell from my reading how to know just how much charge a pack has.
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09-10-2006 11:06 AM  14 years ago
tchavei

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Portugal

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Ok. You are making two questions here:


1st: How do you know when a li-po battery pack is charged?

You know when your pack gives you 4.2V per cell. On a 5s that would be 21V

2nd: How do you determine the status of the charge on a pack

On the field, the only way to know is measure the voltage under load. Its farely common to use the 7.0V under 1amp load rule to fly (for a 2s). If it goes under that. Stop flying.

At home, without load, a cell is considered discharged when it goes down to 3.4V per cell. That would be 17V on a 5s


Hope that helped

Tony

--------------------
"Perfection and patience usually walk side by side..."
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09-11-2006 07:39 PM  14 years ago
lonnewheli

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USA

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Use the auto cut good charger
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09-11-2006 07:58 PM  14 years ago
jwpjr

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Tampa, FL USA

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I am using the Bantam e-station 902 that costs almost $200.00. I can not determine from the manual if it's an auto-stop charger or not. Beleive me, I've read and re-read the manual and perused the Yahoo and Google responses to find the answer. I might have overlooked that info, but it's not for not trying! Many thanks.
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09-11-2006 08:08 PM  14 years ago
Trooper Sam

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Perris, California - USA

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I'm pretty sure that charger will stop charging when it determines that the battery has reached capacity. It looks like a nice one, and with their PB-5 balancer, would give you the individual cell voltages too.

For that money, I probably would have gone with the TP1010C and the 210V balancer.
Trooper Sam

We do not do this to save money, we save money to do this-TheRickster
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09-12-2006 12:12 AM  14 years ago
Yug

rrMaster

UK. Herts

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Hope you're using a balancer ?Vegetable rights and Peace
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09-12-2006 12:59 AM  14 years ago
jwpjr

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Tampa, FL USA

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No, I'm not. I knew nothing about all of this and asked for everything I would need to get flying. A balancer was not included in the equipment I purchased.
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