STIHL Battery Overview | Which gives you the longest run time 

I have the GTA26, 161T, 220C, MSA300, BGA86 and the Trimmer 135, batteries I have AP200, AP300, AP300S, AP500S and AS2, all the machines are great no doubt about, battery technology still light years away for professional use.

cheers for the info. I was going to get a battery bundle with AL 101 cgarger but 3 to 4 hour charge time is insane

Thanks for sharing