Dyson Stick Vac battery pack. Is the battery protection design flawed?

[mark_m]

@AlanC

Further research revealed many had followed this path and gone into great depth. It turns out the battery management circuit, once it decides a battery is dead, it is a final decision and recharging, rebalancing or replacing the cells did not change this. This is a dubious design decision. A more serious flaw is that the so called battery management circuit included an IC that could rebalance cells but this feature was not implemented.

Are you able to provide evidence this is how it is? EG image of the PCC, diagrammatic circuit details, other sources.

Do Dyson offer a 2 year warranty on their batteries? It seems odd that Dyson would risk a battery pack being recharged several hundreds of times over 2 years, without some method of of charge equalisation.

@AlanC

My point is that this scheme was not implemented on a quite expensive battery pack, and it is only luck that a pack lasts as long as it does.

Apologies, it’s important that this technical detail aspect is able to be verified. Most consumers could reasonably expect a lithium rechargeable battery to last more than 2 years. Perhaps 3 or more without significant degradation based on other devices. It’s not readily apparent from the top hits on the internet that Dyson has designed a fault into their product, or that it is not fit for purpose?