Be aware that there are a pair of tiny little ports in the belly of this beast which are extremely easy to plug up with meat juices. They can be a royal pain in the neck to unplug. Mine sucked in a little bit of stuff from a pork chop, and the next time that I went to use it, the motor ran but it did not develop any suction. Taking it apart is not straightforward, but I know how to do it now. Those who wish to inquire may become enlightened.
@werehatrack OBTW, I can now confirm that the battery inside the unit is an 18650. I didn’t try to see if it had any capacity markings on it, because it doesn’t need a heck of a lot of capacity to do household level sous vide suction tasks. It has a pair of welded-on leads and a small rectangular plug, so it’s not going to be a simple snap in replacement if it eventually fails. But at the price of this unit, who cares?
@hedgehogfrenzy I had to leave mine connected to my charging wart overnight, you might try that. If you want to try opening it up and replacing the 18650 inside, I can provide some pointers on how to get it open and apart.