While lead acid offers some flexibility in terms of voltage cut off, manufacturers of Li-ion cells are very strict on the correct setting because Li-ion cannot accept overcharge. The differences with Li-ion lie in a higher voltage per cell, tighter voltage tolerances and the absence of trickle or float charge at full charge. The Li ion charger is a voltage-limiting device that has similarities to the lead acid system. (See BU-808b: What causes Li-ion to die?) They blame capacity fade on ions getting trapped, but as with all battery systems, internal corrosion and other degenerative effects also known as parasitic reactions on the electrolyte and electrodes till play a role. This claim carries merits but if the scientists were totally right, then the battery would live forever. Battery scientists talk about energies flowing in and out of the battery as part of ion movement between anode and cathode. ![]() Charging and discharging batteries is a chemical reaction, but Li-ion is claimed to be the exception.
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