Researchers from the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) have developed a new lithium metal battery that can be charged and discharged at least 6,000 times — more than any other pouch battery cell — and can be recharged in a matter of minutes.
You will only get 80% of energy per charge cycle, but that cycle will "damage" your battery 5x less than charging it to 100%. So in far future, you get 5x 80% = 400%, instead of 1x 100% = 100% of the power. In other words, you will be able to charge the battery many more times, also getting more power out of it, before it dies.
It's down to how many years, or charge cycles, you want the battery to last for. If you limit the charge to 80%, then you will have to charge more often. But the increase in battery life will be considerable and it may live for many more years. A LiIon cell that's treated gently can last 10 years or more.
The fully charged battery is brimming with electrochemical potential and is not healthy in the long term for itself, for its anodes and cathodes, for wires and solid state electronic gizmos in the high voltage loop. Charging it to 100% once in a while just before you use it is not a big deal.
And, because plating and stripping can happen quickly on an even surface, the battery can recharge in only about 10 minutes. The researchers built a postage stamp-sized pouch cell version of the battery, which is 10 to 20 times larger than the coin cell made in most university labs.
As you can see, charging to 80% instead of 100% multiplies by 4 the amount of energy the battery will have transferred to you over its life - the only tradeoff being to compromise on how much energy you can get out of a full charge (big slices, small cake VS small slices, large cake).
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