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« on: October 26, 2016, 12:34:29 PM »
vickyace
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What I mean is if I have a lipo battery that is rated for 500-800 charges and I only want it as a backup battery how long will this battery last? That is to say is it 500 charges forever? Like if I take an unused lithium ion battery is 5 years old and start using it will the charge be just as good as if I used it brand new? And will I still get that 500-800 cycles?
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« Reply #1 on: October 26, 2016, 01:34:11 PM »
Balakrishna Reddy
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Lithium batteries are very powerful densely packed and also very sensitive to temperature changes.
As you have asked yes you can store your Lipo for 5 years but some conditions have to be met like the temperature must be favourable to it and also the storage charge must be close to 50%. Storing in this manner will not do much  damage to your battery. However its efficiency may degrade with time at very less rate as that of new.
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« Reply #2 on: December 20, 2016, 10:33:53 AM »
CarlWatts
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If you need help regarding batteries.

I recommend visiting this site. http://www.redsradiocontrol.com/-desire-power--batteries-128-c.asp . Maybe you can ask for details.
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« Reply #3 on: June 25, 2017, 06:31:49 PM »
Power_user_EX
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Lithium batteries, in general - be it LiIon or LiPo, if treated properly last for a long time. Though their capacity will reduce overtime but its tiny compared to NiMh. Unused battery if stored at a nominal 'storage' voltage won't suffer much. You 'might not' be able to use a 5 year old unused LiIon like brand new but It would still be having a good amount of capacity if it was stored properly at correct voltage.

IIRC its life may reduce it you keep on charging to 4.2v for 3.7v cell , if you reduce the cut off voltage to 4.1V for a 3.7V cell (don't confuse with older 3.6V LiIons which have 4.1V cutoff) its life will(might) increase but at a lesser capacity(since you not fully charging it) and hence you can get more cycles. This is applicable for LiIons - not sure if it applies for LiPos but most probably it must.

Also make a point to use a good charger and if possible calibrate it using a good multimeter(not the cheap chinese ones). Note that Lithium chemistry inside LiIon/LiPol has very less tolerance to overcharging and overdischarging which results in permanent damage.

A side note on primary lithium (non rechargeable Lithium) : Check the page 2 of this - http://data.energizer.com/pdfs/nickelmetalhydride_appman.pdf handbook from energizer which states that : Primary Lithium retains 80% of its capacity upto 15years! Don't know how long can a secondary lithium(rechargeable - LiIons/LiPos) can hold its charge for a given amount of time from any reliable source.

Hope that helps.
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« Reply #4 on: June 25, 2017, 08:32:02 PM »
K K Iyer
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What I mean is if I have a lipo battery that is rated for 500-800 charges and I only want it as a backup battery how long will this battery last? That is to say is it 500 charges forever? Like if I take an unused lithium ion battery is 5 years old and start using it will the charge be just as good as if I used it brand new? And will I still get that 500-800 cycles?


No experience of how many cycles, but have some experience of how many years a lipo may last.
Over the last 11 years since I went electric, about a dozen of my lipos died, but most lasted 5-6 years of sporadic use (say 25 flights a year on each).

1. I believe the biggest killer of lipos is storing them fully charged.
2. The second biggest reason is drawing too many amps. I usually never draw over 10c from a 20c lipo.
3. The third is using them for too long in each use. I usually never go below 3.8v per cell.

I guess I'm too conservative, (no helis, no 3d, no quad).
But when stored at 3.85v, I've been able to use them after a gap of 2-3 years!

Lipo may however not be a good choice as a 'backup battery'
Hope you find this of some use
Regards.

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« Reply #5 on: June 26, 2017, 11:08:51 PM »
Rcjabalpur
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Iyer sir has covered most of the things. One other silent killer is the ambient temperature, storing your batteries at high temperature would damage them . Store them at room temperature.
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