Needing a newie & couldn't afford a Makita with Li Ion so bought a Rockwell. Heap of junk ($100 wasted). If not use for a few days it was like a Ni Cad that hadn't been used for months. Next step looked at Panasonic but way too dear for chinese made so bought Milwaukee Fuel brushless set(chinese made also) of drill/driver + impact driver + grinder & 2 by 4amp batts which cost me about 600 (about the same price as the Panasonic drill/driver). after 4 years had to replace one batt ($115) & since sold my stihl back blower & bought a Milwaukee ($300)blower.They do take a couple of hrs to charge but I can now buy 5, 6, 8, 12 & 18 amp batts if I fall short but the 2 by 4amp is sufficiant for me now but a bigger one is tempting as the blower chews power but I only use it once a week. The 5 amp is coming down in price & now about $135.
Most Li Ion batts, I've read, have a life span of around 3 years whether using or not but I got 4 years from first one & other is still strong.