donbeatya

iTrader: (18)

I'm deploying to Korea for 9 months. I have 3- Protek 7.4v 2s 2000mah lipo batteries, 1- Protek 14.8v 4s 2100mah lipo, 1- Protek 6.6v 2100mah LiFe. I would like to know what to do with these so that they are still good when I get back in 9 months. My charger is the Hitec X4 A/C Charger.

wever75

iTrader: (1)

I would assume all you could/would do is a lipo storage. Maybe you want to do a lipo balance also so the cells stay balanced. Congratz on your deployment!

Hoese37

iTrader: (5)

Charge them on storage mode. Place them in some sort of metal or sealed container and store in a stable temp.

donbeatya

iTrader: (18)

K thank you guys!

ThePanda

iTrader: (68)

store them at a little over 7.4 volts. they will slowly seft discharge.

store them separately. otherwise if one goes bad, then it doesn't ruin the others. nd store them in some heavy duty containers. (fire proof)

donbeatya

iTrader: (18)

Why store them in fire proof? Iwas thinking just thinking in Individual plastic containers with rice in them to prevent moisture from effecting them.

t2o

I stored several lipo's in the freezer for about 2 years.

The strong ones were still strong, and the weak ones were still weak, after they went back into service.

I put them in a zip-loc.

Dave H

Storage voltage (3.8~3.85V per cell), put them in a airtight container, tupperware/freezer bag etc (to prevent condensation) then store in the refrigerator. When taking them out allow for plenty of time for them to warm up, don't charge or run cold. Charge and discharge at 1C, then use. Or at the very least a dry and cool place.

KFXGUY

iTrader: (11)

Someone said put them in the freezer at half charge. I personally would charge them to 3.85v per cell. Of course it would be safer to store them in a fireproof container or bag.

Dave H

Half charged is about 3.85V per cell.

7.4V, 3.7 per is only about 10~15%, seems kind of low to allow for a little self discharge.

ta_man

iTrader: (168)

Might have been me. I store my 4S LiPos like that over the winter (when I can't run 1/8th scale in New Jersey). Have some packs that have been in the freezer for 2 winters (and this will be the third) and still run great.

ThePanda

iTrader: (68)

just in case they go poof. since you are away, you can't do anything if they pop. better safe than sorry.

Jim Hustins

iTrader: (4)

DO NOT STORE THEM AT 7.4V!!!!!!!!!!!!!!

Store them at 3.85v per cell for lipo. That is the most stable voltage and they will not discharge. For Life I do not know what the storage voltage.

Put them in a ammo box. If you have a fireplace that will not be used. That will be a great place to put the ammo box.

KFXGUY

iTrader: (11)

I put mine at 3.85v every time they are going to sit for more than a day or two. May be a little anal. I also only balance charge my batteries every single charge. Ill go run the vehicle or boat, battery gets to cutoff I let it cool off then put it back at 3.85v. I may be over working myself, it still makes me feel better. Lol

ThePanda

iTrader: (68)

do you realize that the difference between 7.4 for a 2s and 3.85 (per cell) for a 2s is only a difference of .15 volts per cell? [3.7 vs 3.85]

and all batteries self discharge, lipo no different.

actually, it is recommended as a general rule to store lipo batteries at ½ charge. a charged lipo at 8.4 volts -6.4 for discharged = difference of 2. take ½ the difference and do 8.4 - 1 = 7.4 volts, which is ½ charge. though, for such a long time period, a higher voltage is probably better. so yeah, i don't know why you had a little flip right there...

maybe just know a bit what you are talking about...Im not starting a fight here, just providing actual information.

and if you read my earlier posts, i do say a bit above 7.4, to account for self discharge. (which is about 1% per month at 50% charge)

lets do the math again. 2 volts diff between charged and discharged (8.4, 6.4) is 2 volts 1% of 2 is .02 volts self discharge per month. 9 month absent is .18 discharged. 7.4 volts - .18 soft discharge is 7.22 volts (too low) so thats why i said a bit above. for the application, 3.85 is actually a fair bet to go with, as starting at 3.85, at the end of 9 monte, they will be around 7.35. for shorter time frame, a lower voltage (around 3.7) is just as good, if not better.