Further to my posts at #2158 & 2159, apparently there has been another battery failure since the 787 was re-certificated with improved batteries in a fire proof box. Details at
http://www.mlit.go.jp/common/001064275.pdf .
Clearly the battery is still not working properly, failures are likely several times a year as the fleet grows and airworthiness relies on the box – a very strange situation.
No wonder JTSB continues to call for a proper redesign:
"Therefore, it is considered to be necessary that
- Boeing examines the potential causes pointed out in Boston and Takamatsu incident investigations and Narita event assessment further, accelerates the consideration for the design improvements, gets the certification early for the design changes which should be implemented, and provides the design changes early for airlines.
- Airlines adopt the design changes which will be prepared by Boeing and implement them as soon as possible."