To make matters worse, Stihl's estimated run time with this battery, which is the largest available, is only 25 minutes. So if you can't mow your lawn in that time then you either need to take a break and wait for the battery to recharge, or spend another $200 for an additional battery. Since this is a tiny mower with only a 14.5" cutting path, only very small yards are going to be mowable in less than 25 minutes. Meanwhile, the same size Recharge Mower model PMLI-14 Li-Ion mower retails for far less at $459, complete with battery and charger, and has a longer projected run time.
Sigh.