I wonder what benefits many cell system have over single battery cell systems. Since Tesla has a car with 7000 cells. Surely there has got to be many benefits. My idea is then that mobile device like the smartphone or wearable device also is equipped with a multi or many cell system. This means that the battery inside your phone would then be built of many smaller cells. I believe that one benefit would be that the battery still works even if one cell goes bad. This would then extend the life of the battery system. Another advantage would be parallel charging where you could charge much faster.