@JLeslie Yes, many people do that.
@Judi I am well aware. Now, bear with me while I tell you about my childhood.
When I was just barely a pre-teen, I got into radio control cars. Not the cheap ines you see at Toys R Us, but the ones that come in a 500+ piece kit and cost more than I paid for the car I actually drive to work. At the time, the only battery packs they had were all NiCad (1.2 volts per cell), and most packs were six or seven Sub-C cells of a mere 1200mah capacity; good for ~15 minutes with a stock Mabuchi RS540 motor, but barely 4 minutes with a race-tuned Modified. Also, many people failed to exercise proper charge/discharge discipline, thus causing the battery pack to do what Nicads do and lose capacity do to memory effect.
About four years after I got into it, they came up with 1700mah Sub-C cells that cost 2–3 times as much and were a bit delicate; you couldn’t fast-charge them as quickly nor run a highly modified motor as with a 1200 mah cell because the amperage would overheat them and ruin the cells in a very exothermic manner. However, they would allow a stock/“superstock” car to run almost 50% longer between charges.
Not too long after that, they managed to solve the durability issues, allowing full fast-charging and use with even an 8-turn quad-wind drag-racing motor. Fifteen years later, I am running my RC-10T around the Hangar bay of the USS Constellation with a 2700 mah pack that is more durable than the old 1200 mah packs and cost about the same once you account for how much the value of a dollar changed in that time.
Of course, they were still NiCads and thus prone to memory effect; many people lost half their charge capacity within a year and couldn’t figure out why even when you told them. I had one that held 80% of it’s capacity after >20 years because I read the damn directions and did the proper cycling. Nowadays, for the price of an old 1200mah NiCad pack, I can pick up a 3000mah NiMH pack of the same size, weight, and voltage. And for the price of a first-gen 8.4V 1700mah NiCad pack, I can get an 11.1V 5000mah LiPoly pack of the same size/weight; that added voltage can make a modified-class rig go like a raped ape with flaming asshairs (modifying a car to do 30 MPH used to be impressive; some nowadays do >50MPH in stock, out-of-the-box form) and the added capacity allows it to do it for more than 4 minutes.
So, in less than 20 years, we had appreciable increases in capacity and durability while dramatically lowering the cost in dollars, space, and weight per watt-hour.