Running rpi from battery

[EddieM]

Hi,
I am trying to power my rpi with a 3.7v 3000mah lithium ion battery through an icstation boost module to boost the power to 5v. I am running the power to the rpi via a micro usb plug I soldered. I measure the power at the micro usb and it looks good. When I plug it into the rpi the red power light comes on, then the green booting light flashes a couple of times, then both go out and the sequence repeats. The 3.3v and 5v pins on the gpio pins read good also. It never seems to boot. What is the flashing sequence telling me?
Eddie

[W. H. Heydt]

What model of Pi are you trying to power? What is the current rating of your boost converter?

That said... I frequently run Pis (up to the Pi2Bv1.1 and Pi3A+) from commercial "powerbanks" which are--essentially--what you're trying to do. For Pi0/Pi0W with a 3.5" LCD attached and a Pi3A+ with only headphones attached, I use 4Ah powerbanks rated to provide 1A. For a Pi2Bv1.1 with RPF 7" display, keyboard, mouse, and WiFi dongle I use a 10Ah or 10.4Ah with a 2.4A port (for the Pi) and a 2A port for the display. All of these setups work without problems.

[EddieM]

Oh! Well, duh. The spec for that boost module does say 2a peak. And that is what it is acting like. The rpi is a 3b+.
I’ll go revisit amazon and see if I can if I can find a more appropriate one.
Eddie