Confirmation on the Galaxy Fold 2's support for super fast charging comes from code found inside the Galaxy Note 9's Android 10 firmware, as discovered by the folks over at XDA Developers. A charging animation file named “bloom_front_charging_effect_superfast” was discovered in the firmware; “bloom” has been rumored to be the codename for Samsung’s upcoming clamshell foldable phone, and the combination of the words ‘bloom’ and ‘superfast’ seems to be a pretty clear indication that the Fold 2 will have 25W fast charging.
On the Galaxy Note 10+, the super fast charging tech can charge the phone at a maximum of 45W, but we're assuming the Fold 2 will max out at 25W. That's because the Fold 2 is expected to have a rather small battery as far as the current standard for smartphone battery sizes are concerned. One of the device's two batteries has a capacity of just 900 mAh, and though the other battery could be considerably larger, the overall battery capacity is likely to be under 3,000 mAh owing to the clamshell form factor.
