Galaxy Z Flip to charge slower than the S20, could that mean a small battery like the Razr?

First we heard that it will be cheap, much cheaper than its direct Moto razr (2019) competitor, and perhaps the cheapest foldable phone upon release this spring. Leaked specs include last year's finest Snapdragon 855 chipset, which is still better than Motorola's choice, a dual camera on the back, and no wireless charging to keep costs down.
Not only will it ship with a 15W charger in the box, but that would be the maximum you'd be able to charge the battery inside with, too. That's in stark contrast with the Galaxy S20, S20+ and S20 Ultra, all of which will be able to take ultrafast charging in, and will also ship with 25W chargers on board.
That's why you shouldn't let the fact that the Galaxy Z Flip ships with Samsung's bog standard 15W charger deter you from getting it. After all, Samsung's first clamshell with foldable display is likely to be the most affordable bendy phone, and it will probably have a mid-size battery that won't need that much time to recharge as the huge S20+ or S20 Ultra packs in the first place.