Some things that may not be known.
1) Batteries can "dump" power into a motor fast. This is absolutely fantastic for situations where rapid power is needed. One need only look at the better quality Lithium jump starters that can crank a big Diesel stupidly fast for 10 seconds to understand this.
2) There won't be significantly more powerful batteries. Lithium is king of the active metals on the periodic chart, and only contains "just so many" ions to move.
3) The Solid State batteries are 1/3 more energy dense, as they simply eliminated the anode. That's it, no magic. 1/3 smaller/lighter. There are downsides and SS batteries may not ever make it to chainsaws.
4) Charging won't ever be instant. But battery swaps are a great method for tools.
5) One really big battery can quickly charge a smaller battery. Example, a 300KWh battery can charge an EV's 80KWh battery at the highest acceptable rate. A tow truck carrying a big battery could zap a dead Tesla Model 3 a whole bunch faster than any portable generator. The Model 3 can accept 250,000 watts of power during initial charge. Not so easy to tote around a 1/4 million watt generator.