Yes, depends on how much and what you are trimming. When I bought my HSA86 they were the largest set of standard cordless trimmers that Stihl made. I used them for light - medium trimming jobs, anything too large had to be tackled with the petrol HS81R. I have been very impressed with how light they were and the battery life, typically around 3 hours on AP300 battery, two fully charged batteries keep me going all day hedge trimming and take just over 1 hour to charge from flat with AL300 charger. I bought the telescopic long reach HLA85 trimmers too, and was equally impressed with the performance. However, I have trimmed hedge for 3 seasons with both sets and have started to experience a few major problems towards the end of 2018 season. The microswitch in the front handle on the HSA86 started to play up and became intermitant in its operation and had to bypass the switch and permanantly connect to two wires to get working again on the job site. The HLA85 failed around October last year when I still had of hedge cutting jobs booked, hey failed whilst on a job so had to use the petrol trimmers to finish off. The problem was the worn gears, although the trimmers have an overload protection, I believe when the gears begin to wear the overload protection didn't seem to work well. The motor has an helical shaft that drives a large gear that in turn works the blades. You have to replace the whole motor and large gear, Stihl dealer got me price it was going to cost around £150 for parts + fitting, quoted me £350 for new trimmers, so bought a new set and kept old ones for spares. The HSA86 have now started to experience similar problems with the drive shaft and gears. I'm tempted to invest in the HSA94 T, would expect they are more robust for Pro use, but a lot more money and not strictly cordless as you need to carry battery on belt or backpack. I do like the HSA86 because they battery fits in the trimmers and definitely buy another set. The Stihl MSA200 chainsaw is pretty good too.
Has anyone had similar problems with their cordless tools?
Hope this may help those are considering going cordless.