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mikenike

Heliman

Ga.

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Can Life batteries be kept for a few months at full charge or should they be brought down to storage charge. If so what would be the storage charge voltage.

09-03-2016 06:19 PM
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JuanRodriguez

Elite Veteran

The Villages, Florida

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My understanding is that full charge is fine ....

Been there, done that and old enough to know better.....

09-03-2016 06:40 PM
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Heli_Splatter

Key Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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Well, my definition of storage would be a month. Why take a risk with expensive batteries? Just use your charger to bring them down to storage level.

09-03-2016 07:55 PM
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BarracudaHockey

rrMaster

Jacksonville FL

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Full charge is fine, they will stay there forever and not hurt the batteries.

Andy
AMA 77227
http://www.jaxrc.com

09-03-2016 09:16 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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Ive never been able to find any official documentation that specifies an actual "storage voltage" for LiFe batteries. The white papers from A123 just mention giving the cells a boost charge every 4 years when kept in very long term storage.

See page 20:
http://www.formula-hybrid.org/wp-co...esign_guide.pdf

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

09-03-2016 09:43 PM
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Heli_Splatter

Key Veteran

Silver Spring, MD by way of Sidney, Ne - USA

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google it... most say not to leave them at full charge.

09-04-2016 05:38 PM
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BarracudaHockey

rrMaster

Jacksonville FL

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Thats funny because they have been saying since they came out that they can be charged fully and left sit. They have very little self discharge and don't get damaged by storage.

YMMV

Andy
AMA 77227
http://www.jaxrc.com

09-04-2016 08:25 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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google it... most say not to leave them at full charge.
Who is "they" ?

A123, the folks who invented it dont say anything about a specific storage voltage. Any other "they" is just internet speculation and worth about as much as you paid for it, IMHO.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

09-04-2016 08:32 PM
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Four Stroker

Elite Veteran

Atlanta

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My charger has a LiFe storage voltage of 3.3 volts. I bought a box from the factory and sure enough every cell was 3.30 volts. Unfortunately, if you select Storage from the menu when a battery is fully discharged, it puts a little back in and stops. If you select Storage for a fully charged pack, it only take out a little and stops. So Storage charge has no meaning. I usually discharge the pack and then do storage for very long term storage. But if a pack is good for thousand cycles most people will never know the difference anyway.

"We have met they and they is us."

09-04-2016 09:16 PM
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crazydave

Heliman

Belleville IL USA

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Do not store them at full charge. I have lost 2 soft pack LIFE packs to puffing do to being stored at full charge. I didn't think it was an issue storing them at full charge either, but now I am buying 2 new batteries. Now I run a discharge monitor the mA removed, and shut if off about 1/3 capacity removed for long term storage.

09-05-2016 02:33 AM
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Jim-bob

Senior Heliman

Little Hocking OH USA

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I can only give my own experience. Bought 2 new A123 packs from ElectroDynamics and installed in a Bipe I was finishing up. Cycled them both and fully charged them. Due to other life issues these packs sat for over 3 years. Finally got around to pulling the bipe down out of the rafters and pulled the packs as I was sure they were toast. Much to my surprise they still had almost full voltage when checked and took very little MA to top off. After cycling both I still use them today. I don't recommend this but these particular two packs show no ill effects from sitting fully charged. All charging and cycling done with a PL-6.

PS. Do NOT plug them into a standard switch and charge jack without modification. Also I think there is a difference between LIFE and A123.

09-05-2016 12:55 PM
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jharkin

Senior Heliman

Holliston, MA - USA

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My charger has a LiFe storage voltage of 3.3 volts. I bought a box from the factory and sure enough every cell was 3.30 volts. Unfortunately, if you select Storage from the menu when a battery is fully discharged, it puts a little back in and stops. If you select Storage for a fully charged pack, it only take out a little and stops. So Storage charge has no meaning.
Exactly! This is what a typical dishcarge curve for LiFePo4 looks like.

To those who think there is a storage voltage(even though the MFG says there is not, but I'll humor you) - tell me if you can find the exact 50% voltage point on that graph ... I cant... If you could you would need to measure it out to 4 decimal places or so.
PS. Do NOT plug them into a standard switch and charge jack without modification. Also I think there is a difference between LIFE and A123.
Let me guess - you bought packs that where wired to balance thought a servo lead, right? When you get them like that the white/yellow signal line is the balance tap and you need to cut that wire off on the RX side of the switch. That's a common practice (I do it) and your battery should have come with instructions indicating this.

-Jeremy
Whiplash-G
Helix 700G
T-Rex 450 fbl conversion
alot of planks

09-05-2016 02:21 PM
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Jim-bob

Senior Heliman

Little Hocking OH USA

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Let me guess - you bought packs that where wired to balance thought a servo lead, right? When you get them like that the white/yellow signal line is the balance tap and you need to cut that wire off on the RX side of the switch. That's a common practice (I do it) and your battery should have come with instructions indicating this.
No I bought the right type switch to balance charge from the start. Same place I bought the packs. But others have not, hence the point I was making about modifying the switch. You are correct about instructions. Every pack I've bought with a center tap has clear directions about how to go about it.

09-05-2016 05:07 PM
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Four Stroker

Elite Veteran

Atlanta

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Well I rewire the switch and use 18 AWG from the battery to the switch through a Deans 4-pin AND use the two servo type plugs for the RX bus. I charge through the balance lead which is directly connected to the battery.

09-05-2016 09:42 PM
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