The Galaxy Z Flip 3 is undoubtedly the best clamshell foldable you can buy at the present, with both specs and designs upgrading over its predecessor, the Galaxy Z Flip. It has a Snapdragon 888 chipset, 8GB RAM, 128GB or 256GB storage, and a smooth 120Hz refresh rate. When flipped open, it has a 6.7-inch display, and if you want it to fold, it is super convenient to fit in your bags and pockets.
However, in some aspects Galaxy Z Flip 3 remains the same as before, such as cameras, battery capacity, and charging speed. The phone is still 3300mAh, a rather tiny battery that rarely lasts more than a day, let alone the powerful Snapdragon 888 and 120Hz display may drain the battery even faster. The Z Flip 3 has a new feature called “Protect battery”, once enabling it, the charging will be limited to 85% so that the lifespan of your battery will be extended. Just go to Settings>> Device Care>>Battery>>More battery settings. Then find the Protect battery and toggle it on.
Samsung says that the Galaxy Z Flip 3 support 15W fast charging and 10W wireless charging. 15W is not a very fast speed, but it is enough if you are that eager for fast charging. Z Flip 3 only has a USB-C to C cable in the box, so you have to use the adapter you already have or get a new charger that has a USB-C port, such as Anker 18W Wall Charger, Spigen GaN USB-C Charger, and Yootech USB-C Fast Charger Block.
The foldable also support reverse wireless charging, or Wireless Powershare, which you can use to turn your Z Flip into a wireless charger and share the power with Galaxy Watch, Galaxy Buds+, or other Qi-certified devices. It only reaches a 4.5W charging speed, and the Powershare may not function if the battery is lower than 30%. Anyhow, it could be incredibly useful in particular situations when charging cable, power bank and the like are all unavaible.
blog.easyacc.com 
both 15 watt and 10 watt charging are slow for me.
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