Makita drill has the most advanced charging system available and it charges in only 15 minutes! Generically, it's called a "smart charging system." A computer chip inside the battery lets the charger know exactly how to optimally charge the battery, to completely charge each cell within the battery and for maximum battery life. Each battery is made up of smaller 1.2 volt cells. Often a battery will drain unevenly during normal use, at different rates within these internal cells. A normal charger will stop charging the battery when one cell reaches maximum capacity, not all of them. Once this happens once, it will continue to do so as long as you use the battery. What this means is your 18-volt battery is now a 16- or 17-volt battery and it can drop even lower.
Makita BDF452HW 18-Volt Compact Lithium-Ion Driver Drill Kit
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