Yes technology has changed dramatically. The most expensive item nowadays is your cameras Li-ion battery.
Gone are the days of using AA batteries, cheaper and purchasable almost anywhere. Prior to that the Bolex Triple turret (zooms had yet to arrive) camera had a clockwork motor. No need to worry about batteries.
My Canon video cameras batteries disappoint me. The advertised shooting time only applies the first day you charge up the battery. Thereafter the capacity, as shown by the shooting time available, reduces with each recharge. Even although I don't use my camera much the batteries are down to less than half capacity after five years. Plus they discharge quickly even when they are just sitting on a shelf, not attached to my camera.
My older Panasonic batteries for my old SD tape camera are lasting much better. They appear to be keeping their capacity better and keep their charge for long periods.
I only have genuine Canon and Panasonic batteries. I recall Albert Ross having a bad experience with alternatives.