4.35v cells, can i treat them as 4.2v cells and enjoy a longer cycle / calendar life

bestsystem · Sep 29, 2016

In theory by under charging the Li-ion battery, the life should increase.

So is it wise to take a 4.35V samsung ICR 18650 32A as a 4.2V 2xxx mah cell with extended service life?

Also how much capacity i lose by undercharging it by 0.15V ?

Answer thanks.

ChrisGarrett · Sep 29, 2016

bestsystem said:
In theory by under charging the Li-ion battery, the life should increase.

So is it wise to take a 4.35V samsung ICR 18650 32A as a 4.2V 2xxx mah cell with extended service life?

Also how much capacity i lose by undercharging it by 0.15V ?

Answer thanks.

About 100-200mAh per cell, from 4.35v to 4.20v.

Chris

Gauss163 · Sep 29, 2016

Yes, many users charge to lower voltages to extend cell life, e.g. charging 4.2V cells to 4.1V using the Li-ion (vs. LiPo) setting on hobby chargers.

Charging a 4.35V cell to 4.30V will probably yield around 96% capacity, e.g. it ranges from 95.8-96.0% for a 3000mAh LG D1 between 0.2A-5A according to HKJ's tests, a loss of about 120mAh.

Charging to 4.20V yielded between 88.4-89.1% capacity, a loss of about 325mAh.

CuriousOne · Sep 30, 2016

Cells are that expensive nowadays, that you need to save their life at such cost?

oKtosiTe · Sep 30, 2016

CuriousOne said:
Cells are that expensive nowadays, that you need to save their life at such cost?

Probably not, but I personally could consider doing this if I had both 4.2 and 4.35 cells, simply because I could use the same charger without switching between voltages (and potentially overcharging a 4.2 cell).

bestsystem · Sep 30, 2016

CuriousOne said:
Cells are that expensive nowadays, that you need to save their life at such cost?

Occasionally, replacement procedure can be troublesome or you want your device to be maintenance free for as long as possible.

For example sealed boxes, remote locations or devices that may have li-ion battery inside but almost always connected like routers, demonstration tablets etc will be benefited

4.35v cells, can i treat them as 4.2v cells and enjoy a longer cycle / calendar life

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