[clockcycle]

One Word Sony. Remember those Japanese Made, Japanese Cell battery packs that would catch on fire on your lap? Dell, HP as well many other top name laptop/notebook manufacturers sourced their batteries from the same place. Even with high quality control, this happens.

Shoot even USA assembled "TOYOTAS" had their major failure and recalls.. although you have to remember, quality control at those plants aren't up to par with the Japanese plants..

Even the best can fail..

I've mentioned this before in other threads, remember your phone / charger will only charge your phone to 100% and then stop charging. It does not trickle charge.. So if you plugged your phone in at night and it finished charging to 100% in 2 hours and you unplugged it in the morning from a "full charge" you have to consider that the phone was using the battery the other 6 hours while you slept (assuming you sleep 8 hours) hence at 90%.. Best practice is to top off your battery (unplug and plug in your phone), before you leave the house..