anshuljain

foggyhill said:

anshuljain said:

A simple Reliability analysis on the battery component would have let the engineers know of the expected life of the batteries with a certain confidence (usually around 95% confidence). This should have been followed by an accelerated life testing to determine the age. Seems like they didn't do this proper Reliability assessment properly or discovered it after he products were launched (through extended Reliability tests and/or warranty analysis) is that's pretty dumb. 

Not everyone uses the battery the same, the issue is not the battery reliability  at all ( except for the batch they replaced for the iPhone 6). At least try to read the actual issue.

One can make a fairly good predictive model on the analytical data to predict usage with a fair amount of certainty. Obviously, it isn't a 100% accurate model of the usage pattern, but from a pure reliability engineering standpoint, I'd accept a model that's even 80% accurate to aim for a reliability estimation of the usage. 

Their reliability Engineering team needs to be fired for this fiasco. Guess they relied on the vendors assessment of Reliability estimation (and ask any experienced Reliability engineer and he will never accept a MTBF/MTTF number from a vendor and will perform their own analysis and testing). I know this from my current job in medical devices where we are required to predict battery life for lifesaving medical devices that we design.