According to the Makita website, this isn't something you have to be concerned about. The chargers are designed to make note ...

Makita has integrated many innovative designs into its power tools and the battery systems that they correspond with. In fact ...

In the video after the break [HammyDude] points out that the Makita charger applies voltage to all of the cells in series. It’s incapable of balance charging so when one cell dies the battery is ...