Question about Liini Bottle warmer for on the go

Yes, I would say 2x warming up with a little keeping warm is possible. Maybe 3x without keeping warm, but I've never done that / needed it.

It's OK if you want to heat 2-3 bottles and use them immediately. However, if you want to keep a bottle warm (e.g. for when the baby cries at night), this only works for a few hours (4-5h).
Charging the battery takes a relatively long time.