Life Cycle of a Lithium battery pack, how many cycles should it last?

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Author: The 8-Bit Guy

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In this video I'll give you the straight dope on what all that stuff about battery cycles really means. Here's that link to Apple's website on cycle life: http://support.apple.com/kb/ht1519

Comments

But what if you never discharged the battery? I mean most of the people are always charging, unless they travel somewhere. So that would mean no cycles?

Charging to 4 volts per cell may double life ie 70-80%

How do I find out how much cycles my device can take? Googling doesn't help.

what about overcharging? I heard you shouldn't leave your cable plugged into your laptop when it's already full?

adric22

what I had a really cheap tablet the battery thing said 100% and then died then I charged it and it had the full battery picture and said charging -1.34595858542900 it confused me but the tablet would get lines on the screen if I played it on the charger

Im a fucking 18650 nerd though and though. This video seems pretty
accurate. I want to point at Li-ion batteries do not like to be at high
voltage for to long or they degrade quickly. The best way is to keep
these cells like your phone and laptop around 50-80% state of charge
which is the optimum. Batteries do not like to be low for to long
REGARDLESS of chemistry. A high depth of discharge battery is a dead
battery. If I get a battery on ebay and its completely dead. The best I
can do is charge it EXTREMELY SLOWLY using my DC bench power supply.
Keeping your phone plugged in will only degrade it faster later in life.
As soon as its full, take it off the charger as soon as soon as
possible.

Buy 1 or more laptop batteries or power tool battery on such like ebay or something
Open the battery and harvest the cells. A typical laptop battery has 6 cells in series-parallel. (3 series, 2 parallel)
On average each cell has a capacity around 2,200mAh (that's why they are often 4,400 as there is 2 in parallel)
Parallel adds battery capacity and series increases the voltage.
Amusing the battery is COMPLETELY dead. Charging such a battery is VERY DANGEROUS
The lower the voltage the higher the "Ohms" (in Milli-ohms, the lower the better)
Start charging it at around 10 milliamps = .010 amps (yes, THAT LOW)
Note: DO NOT EXCEED 4.2v PER CELL
SLOWLY increase the current when the voltage increasing slows down.
With time, a good battery like Samsung, LG and Sony are the best quality and will likely try to recover.
Note that a dead 18650 is extremely abusive to it and you will get about half the cells capacity.
Remember 50% still has power, 2-3 of these cells have the power as your cell phone battery. THEY ARE STILL USEFUL!!!
Because we live in a capitalistic society. The PCB that is connected to the cells are likely to have a shut-off feature that it will cut the power when the battery has reached X cycles. (which is often why they are mistaken as a "dead" battery)
How many seems to be a mystery but would likely very from manufacture.

What brand of battery is used by apple? Samsung? 300 cycles is like so bad

You forgot to mention overcharging, which also decreases the capacity.

My Lenovo Yoga 900 claims to prolong the life of the battery by having a setting that, if the laptop stays plugged in all the time, only charges the battery to 60% and stays there. Is this a good idea, or will it create some issues down the road? I do have my laptop plugged in most of the time, but I do tend to carry it with me a lot and at least one every 2 weeks I use it unplugged for 4-5 hours or until it gets down to between 10 and 15% before I plug it in again. I like to think I am practicing good battery hygiene but could I possibly do better than simply switching it to the 60% setting when it is going to be plugged in for a while?

But don't get a note 7
cough bomb cough cough

Recently my iPhone 6 has been having battery issues. I'll have it charged at 100%, use it for a little while then suddenly it'll read 10% or less. Then as soon as I plug the charger in it'll immediately show 40%. What the hell is going on??

4:28 "make sure that your computer will never shut the screen off or go to sleep". Proceeds to move the slider to the fastest possible time for it to fall asleep.

I am trying to run a camera for more then a minute that's been sitting at 0 volts for a couple years and it didn't work

@4:27 he says set it so it'll never shut the screen off or go to sleep. yet he shows on screen setting it to go off after one minute instead of never

I should probably replace my tablet battery. Its probably on its deathbed. Got it 4 years ago.

Why just Apple?

so my laptop Battery should last less rhan a year? lol

what is weird about the lithium is usable not the shell so you can can build another with the same lithium right.

Oh! By the way! The capacity of the battery starts to drop due to age and use immediately. You may lose a few percentage points in only 50-100 cycles, but usually the battery capacity loss slows. So if it has a "1000 cycle life," that is to x% capacity. I think Apple uses 80%. It will keep working for much longer than that. Probably over 2000.

My MBP battery is 1.7 years old and have 604 cycles on it. It runs hot too. It is at 88% health.

You don't need to "re-calibrate" lithium ion batteries as you described. It won't really change anything. unless you only discharge it down to like 90% and charge it again (very bad for a battery).