That's why I'm not complaining about Apple's assistance, but about the fact that Apple products may present this issues even without third part reparation, like carolineM reports.
Actually, I'm a Apple Fan and I've got many iPhone/iPad in the years, but there are things that get easily bugged or that may present some problems.
Even my problem, for instance, might not be caused by third part reparation because I have it replaced with a original battery (the technician who did it had a iRepair Point and had let me see what does happen with an original battery taken from an iPhone==> the problem with battery usage still occurs), but it's realistically a software bug.
That's why I wanna find out myself and try to fix it. I'm an Apple addicted too, but guess it's more fair to see the flaws beyond the merits.