Capsule Modem Battery with 3x 3350mah 18650 Cells

These modules are super easy to open. The outer plastic case tabs stick out You can just pry outwards and it pops right off. The cells are name brand and will test great since modem batteries only get cycled when a home loses power.

These are the Samsung INR18650-35E Cells. One of the best cells on the market.

Datasheet is in the 2nd photo