As someone who knows a bit about batteries I’ve been saying for years that chemical batteries are a dead end. Capacitave storage is the ticket. Superfast recharge times. And it doesn’t take several times the amount of charge out to recharge them. Capacitive recharge is closer to 1:1 as opposed to 3-4:1 like a chemical battery. They will eventually replace batteries in most applications IMHO.
The thing about conventional batteries is their chemicals wear out or are lost thru discharge/discharge cycles. Their ‘storage’ is dependent upon the presence of these chemicals being possible to rejuvenate.
But with super capacitors, they actually store electrons within their atomic structure, which does not change appreciably over time......................