eindecker 3

How would I determine what kind of charge I would need on my lipo batts for storage.

guver

My Feedback: (325)

3.7 resting is a good voltage per cell.

TheWoodCrafter

My Feedback: (1)

Most charger charge or discharge to 3.85V/cell.
That is supposed to be 50%.
A voltage of 3.7V is pretty much a dead battery.

Goldenduff

I disagree, many low voltage cut offs are set at 3.2v therefore there is some fun to be had well after a cell hits 3.7v.

TheWoodCrafter

My Feedback: (1)

Just because an ESC has a low limit of 3.2V doesn't mean you should be running a battery that low or that it even means anything with respect to how much power you have left in your pack.

It is simply a low limit to protect the battery, nothing more.
You should never be running the battery down to that anyway.

drumduan

"It is simply a low limit to protect the battery, nothing more."

Quoting your reply the low voltage cut off does protect the battery?

Regardless I do not use a low voltage cut off as i find voltage sag prematurely cuts power. I routinely fly down to 3.5v per cell using 3cell hobbyking batteries. I have one that is 2yrs old and flight time are not noticeably shorter, and HK stuff is not exactly quality so I think 3.5v per cell is fine?

guver

My Feedback: (325)

Let's at least remember to make the distinction between resting voltage and loaded voltage since there can be varying amounts of differential between them. I edited my post above to read "resting voltage" That is 3.7 volts resting (for storage)

3.8-3.9 is just fine for all but the newest bestest cells on the market , but 3.7 is fine for ALL cells new and old. That is why I now recommend 3.7 and not 3.85 anymore. Many of mine are all over the place when considered stored. I don't as a rule leave them full ever (unless my plan to use them got interrupted) then they just set full until they are used. I've always thought it best to leave the pack (full) rather than waste a discharge cycle.

guver

My Feedback: (325)

The question really should be answered this way.

Contact the vendor or maker and get the info from them or read the user guide or manual. sorry OP couldn't resist , but that is what you really asked.

trax de max

or set the capacity on the charger and press storage

Mikecam

guver, I understand that IR increases the most with a full battery or an empty battery. It still occurs at 3.85 (50%) but at the lowest of any other volt range. Temperature also affects IR and the fridge is a good place to keep IR to a minimum. So cold in the fridge at 3.85 resting voltage.

guver

My Feedback: (325)

I didn't know that IR is worse "at the ends" so to speak , but what does the IR have to do with storage life?

Alright I see that you aren't saying that it IS WORSE , but rather that it GETS WORSE when stored at the limits. I can agree with that.

Mike, have you noticed any "puffing within hrs or days" with the latest high discharge cells? I'm talking 60-75C cells here puffing when setting fully charged.