I have:
A Kobalt 80V blower, battery failed right away. The warranty replacement works fine.
An EGO 56V blower, 3 years old. Battery works, but now won't hold a charge while sitting on my office desk for a month. About 10 or 11 min on high/turbo, used to be 13.
A Slew of Dewalt 20V tools, blower and weed trimmer. All 4, 4AH 2014-2016 batteries are dying/done. The 6 month 10AH battery won't hold a charge more than 3 days, but works well if freshly charged, the older 6AH battery soldiers on. The 10AH battery is a known problem child, sorry I purchased that one.
A Toro 60V mower with 6AH battery. Battery works properly, but is too hot to charge immediately after use. It must cool for at least an hour before it will charge, and charge time is not 45 minutes, but about 3 hours. It is an epic good mower, and very light.
Bottom line, get all one brand, and use the battery(s) on every tool. That way the battery will age and cycle out normally, and the tools will only need a new battery (or two) instead of 4 different brand batteries, all failing at the 6-8 year mark.
EDIT: Just a note about power. None of the electric tools come close to matching the power and working time of professional gas equipment. All 3 electric blowers WILL NOT blow pebbles/gravel out of the hangars. Sure, they will move em, but just barely. The Stihl gas blower moves the gravel easily.
The best elec blower is the EGO. But it's run time is too short to finish the job in the 50x60 hangar. It will do a "T" hangar easily. It could not do the yard and driveway at my PA home as the run time of 13 minutes is 3x too short. So I used an ECHO 21cc gas blower which runs for 45 minutes per tank, enough to finish everything and then some.