What kind of batteries are you running that can support the equivalent of 15A AC for hours?
I have both a battery leafblower and a corded one. The corded is far more powerful and of course does not run out. The battery one is quick and convenient for small cleanups but only gets about 10 minutes from a full charge, then it's back to the charger for hours.
Recently I cleaned up a large roof full of leaves, took about an hour with the powerful corded leafblower. That would've taken weeks with the battery one given the small power and the ~10 minute runtime.
I mostly use the battery one since it's easier and most jobs I do are tiny. But it is no substitute for the corded one.
Your battery blower sounds like it's just not very good.
I can move piles of wet leaves easily with my makita blower that uses two 18v batteries. It's a pretty old model too.
Batteries can surge power and not risk fire hazard like AC over a long extension cord. Manufacturers know this and have to intentionally limit draw way below the 15A ceiling so a 100ft 14AWG cord doesn't trip breakers or burn houses down.
It's always better to go with batteries for electric outdoor stuff for that (and other) reasons.