GPD Win 4 w/ upgrades
EDIT: Link to the battery is in the comments :)
So I recently got a HX370 win 4 again and I put some upgrades into it and I gotta say this thing is now the perfect travel handheld. Inside I added PTM to the CPU, cleaned the inside a ton as it was used, new thermal pads, additional pads to help with heat, added tighter Hall effect sticks, and even upgraded the battery to a 55w battery. After the battery was added this thing is literally perfect for lower spec games. Almost 2.5 hours on Skyrim running at 12w, HD2 at 15w I get about 2 hours of battery life, and if I stay within that realm of things the battery life is fantastic and performance is great. This is the perfect setup to have along side my Apex as for the apex I didn’t want to travel with it because of the size and I wanted something small and compact I can do virtually everything with. Only thing I’m thinking about changing is the fan and some other internals to make them maintained. So far the battery has held up well and has been fantastic with no issues so far. Right side can get a bit toasty but at 12w I feel virtually no heat. This thing became the perfect travel companion. All I need now is a good front over plate for it.