Once a cell has failed, the entire battery must be replaced and the consequences are extremely costly. Replacing individual failed cells does not solve the problem since the characteristics of a fresh cell would be quite different from the aged cells in the chain and failure would soon occur once more. Some degree of refurbishment is possible by cannibalising batteries of similar age and usage but it can never achieve the level of cell matching and reliability, possible with new cells.

Faulty cells (or blocks) detected by our Active Battery Management systems, may be replaced, without further consequences, since the trickle-current maintenance is provided individually for each cell (or block), by its dedicated charger.