Its battery uses stretch-release strips, some hidden beneath the trackpad; USB-C and MagSafe ports have separate procedures.
What to check before buying
Battery
iFixit specifically notes stretch-release adhesive hidden under the trackpad. That adds disassembly compared with a cell fixed by accessible screws alone.
Ports
The USB-C ports and MagSafe connector have separate guides. Charging through one connector but not the other can point to different hardware.