Running 18650 batteries flat?

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JohnGalway

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Hello,

Strange question. My friend has had two chargers that both died on him. I have loaned him my 18650 charger, it works. He was going to "try something" ( I don't know what) before buying a new charger that involved "draining his battery".

I presume he means running it down flat.

Will this damage his battery? Is it safe?

Many thanks,

John
 
JohnGalway said:
Hello,

Strange question. My friend has had two chargers that both died on him. I have loaned him my 18650 charger, it works. He was going to "try something" ( I don't know what) before buying a new charger that involved "draining his battery".

I presume he means running it down flat.

Will this damage his battery? Is it safe?
Click to expand...

Running a LiIon battery really empty will damage the battery and make it unsafe.

Running a protected battery, in a high power light, until the protection kicks in, will not damage the battery.
Using a very low mode, to run the protected battery dry, might damage it.
 
it wont harm the battery, but given that Lithium Ion does have a limited number of cycles per battery, the lower you run them before recharging the shorter the overall lifetime of the battery is. I don't think it makes a huge difference, but it does shorten its life anyhow.
 
I read somewhere that normal consumers would have to try REALLY hard to get the memory effect to show itself badly enough to be noticed. I know on my NiCd batteries, most are still kicking right along happily.
 
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vpr5703 said:
it wont harm the battery, but given that Lithium Ion does have a limited number of cycles per battery, the lower you run them before recharging the shorter the overall lifetime of the battery is. I don't think it makes a huge difference, but it does shorten its life anyhow.
Click to expand...


running lithium ion flat will damage the battery, not sure what you are talking about?
 
Not completely flat as in 0V, but running them until you hit PCB Cutoff. That won't immediately damage the battery, but will lead to a shorter overall lifespan.
 
Nope. I know what that can do, it has the possibility of not being fun at all.
 
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