Not that simple. My guess is that Boeing and the Japanese manuf are learning, down to the atomic level, just how LiPo batteries really work.

Remember, that when this plane was designed, about 5 years ago, LiPo batteries were a lot different and that is ancient tech by now. My guess is that it will eventually work. It has to. Many design decisions were based on the lighter, higher power density batteries and was primarily the reason they went to a more electric system design.

More weight of the older NiCad's, was not feasible from a design trad-off. To go back to NiCads would be weight prohibitive on an already marginaly over weight product, based on performance guarantees to the airlines.

So, Boeing has to make the LiPo batteries work, or there is no economic incentive to buy the plane--weight and performance penalties wouldn't make it economically feasible. They will have to redisgn the batteries on a molecular level to reduce the heating/venting problems. Miswiring may have been the cause of the JAL incident, but the bigger problem is the system as designed did not handle it.