Any recommendations for Pi 5 battery power?

Has anyone here done any experiments yet to see what works? I'll get a pi 5 in the mail in the next week, hopefully, and will be trying a couple setups to see what gives voltage warnings and whatnot...

• Amp Ripper 4k and 1s pack
• 4s pack with separate charger and buck converter for the pi.

The buck converter route might work better on the pi5 than previous boards because of it's built in power on/off/suspend controls.