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Old Jan 10, 2008, 08:44 PM
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Joined Dec 2007
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Question about lipoly.

I'm new to electric, and am wondering with the lipo batteries. They must always have a balancer right? Do you want to make sure they are always fully charged before you take them off charger? Does takein off before fully charged hurt battery life? Should these batteries be fully drained before recharge? or can you put on charger after half use? I heard lipo need to be stored fully charged? and if this is true if they are not left fully charged does it hurt battery life?

Also the converters for lipo from 120v to 12v DC some are 20c some 40c some 60 c whats the difference? and what is the max amps you should charge at to not hurt your battery life?

Thanks Guys.
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Old Jan 10, 2008, 10:36 PM
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Taking lipos off the charger before fully charging improves battery life.

They should not be fully drained. That will greatly deminish battery life.

They should be stored 1/2 charged. Storing fully charged hurts battery life.

Charge batteries at 1C or less for best battery life.
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Old Jan 11, 2008, 12:13 AM
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Quote:
Originally Posted by NewEDFjetguy
Also the converters for lipo from 120v to 12v DC some are 20c some 40c some 60 c whats the difference?
I don't understand the question.

If you are asking about 110 VAC power supplies to power 12 VDC chargers, and if you mean 20A, 40A, and 60A, then that is the current (Amps) they can deliver.

Bill
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Old Jan 11, 2008, 11:35 AM
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http://www.hobby-lobby.com/powersupply.htm
This is the 120-12v converter

it is 20a 40a and 60a converter, say you have this battery:
"FLIGHTPOWER EVO25-1800 3S 11.1V 25C 45A CONTINUOUS, 50C 90 AMP BURSTS DIMMENSIONS: 108MM/32.9MM/23.8MM

it has 45A continuous, so I would need a 60A converter? or how do they measure this?
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Old Jan 11, 2008, 11:51 AM
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it takes about 60 VA ( volt amps ) to FAST charge a single 3S 2100 mah LIPO pack, so if U plan to FAST charge 4 packs, better get at least a 250W 12 vdc power supply and four LIPO fast chargers

I can SLOW charge 8 packs of 3S 2100 MAH using a $4.99 VOLTAGE CLAMP @ 200 MA
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Old Jan 11, 2008, 12:37 PM
Space Coast USA
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Quote:
Originally Posted by NewEDFjetguy
http://www.hobby-lobby.com/powersupply.htm
This is the 120-12v converter

it is 20a 40a and 60a converter, say you have this battery:
"FLIGHTPOWER EVO25-1800 3S 11.1V 25C 45A CONTINUOUS, 50C 90 AMP BURSTS DIMMENSIONS: 108MM/32.9MM/23.8MM

it has 45A continuous, so I would need a 60A converter? or how do they measure this?
Forget the C rating of the battery when talking about charge rate.

A 3s 1800 mah battery requires a 1.8A current to charge it at 1C. Therefore the 20A power supply should be more than adequate. Many of us are using 10A power supplies for powering chargers for 3s 2500mah packs.

If you plan to operate mulitple chargers at higher than 1C charge rates, that's another story.
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Last edited by hoppy; Jan 11, 2008 at 12:56 PM.
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Old Jan 11, 2008, 12:42 PM
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United States, WA, Puyallup
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Quote:
Originally Posted by NewEDFjetguy
http://www.hobby-lobby.com/powersupply.htm
This is the 120-12v converter

it is 20a 40a and 60a converter, say you have this battery:
"FLIGHTPOWER EVO25-1800 3S 11.1V 25C 45A CONTINUOUS, 50C 90 AMP BURSTS DIMMENSIONS: 108MM/32.9MM/23.8MM

it has 45A continuous, so I would need a 60A converter? or how do they measure this?
You need to do a bit of reading in this forum. Might start here.

The discharge rate has nothing to do with the power supply necessary to charge the battery.

As was pointed out in post #2, charge the pack at 1C or less. In the case of the referenced battery, that is 1.8 Amps. To do that, you need a power supply that can deliver 12 volts at 3 Amps. Of course, the availability of more current will not hurt anything. To see how that is calculated, go here.

Bill
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Old Jan 12, 2008, 11:24 PM
RichardK
Joined Oct 2007
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Quote:
Originally Posted by NewEDFjetguy
http://www.hobby-lobby.com/powersupply.htm
This is the 120-12v converter

it is 20a 40a and 60a converter, say you have this battery:
"FLIGHTPOWER EVO25-1800 3S 11.1V 25C 45A CONTINUOUS, 50C 90 AMP BURSTS DIMMENSIONS: 108MM/32.9MM/23.8MM

it has 45A continuous, so I would need a 60A converter? or how do they measure this?
This is a power supply, not a charger. You need a charger and the power supply requirement is different depends on the charger from 2A ~20A. When you charge the battery, the maximum charge rate is 1C, that is you put 1.8A into the battery and fully charge it in one hour. All you need is no more than 2A power supply.

The output rating of a lipo pack "C" and the maximum discharge current is irreverent for charging the battery. Your EVO 1800mAH pack can discharge up to 45A, but it will be gone in less than 2.5minutes if you continue to discharge the pack @45A.
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