Thanks. This is exactly what I was referring to and explains it well.If he's referring to "voltage" equalization, it's really simple. Lead acid batteries can be overcharged w/o hurting them much. You can take a lead battery to 15 or 16V and it'll only complain with venting off some of the liquid electrolyte, which "usually" can be refilled (even sealed can be refilled if you know how to do it)
Whereas Lithium batteries do not like being overcharged. They have a very narrow voltage range to operate in and going out of that spec is putting the cell/battery at risk.
It's like the difference of inflating a balloon vs plastic bottle. The balloon can expand to quite a size to accommodate the extra air. The plastic bottle will just flat out explode without warning when it reaches critical pressure. (to be fair, a balloon will too, but you have a lot of warning you are approaching its limit before hand)
The chemistry of Pb Lead acid is such that the individual cells in a ,lets say 12V battery which has 6 cells, will come to a "natural" rest voltage of 2.1V per cell for a fully charged battery. Since you can "charge" a Pb battery with a higher voltage to break down the sulfation and remix the electrolyte, the cells after charging will then seek their equilibrium of 2.1V. The interaction between the sulfuric acid and the lead plates dictate this.Thanks. This is exactly what I was referring to and explains it well.
One more question: what about when there is no charge current? Lead tends to still even out voltages (I'm unclear if the cells self discharge to the same voltage or if higher voltage cells drain into and charge low voltage cells) whereas lithium will remain unbalanced. Why the difference?
Yes the excess energy of "overcharging" the Pb battery has to go somewhere and the result is Hydrogen and Oxygen (H2O) Water being "boiled out of the electrolyte. This can be refilled with distilled H2O.it'll only complain with venting off some of the liquid electrolyte, which "usually" can be refilled