If you like speculation you will love the battery research field. Every 12 months or so there is an experimental breakthrough announced that promises batteries with literally order-of-magnitude improvements in every respect. 1000x the capacity. 50x faster charge. 1/10 the weight. Cheaper to manufacture. And inevitably, manufacturing, scaling, rare earth availability, and other impediments mean they never see the light of day. That said, it does seem like we should be seeing some improved energy density batteries soon. As in, within the year. Possibly 3000mah in the size of a current 2200 pack. Slow and steady improvements for the near future.