Pump and Travel Any experience/reviews on the rechargeable battery adapter for a Medela Personal…

Pump and Travel

Any experience/reviews on the rechargeable battery adapter for a Medela Personal Breast Pump (not a Pump in Style, it's the one that insurance paid for). I'm debating between this an the car adapter. We generally travel in the car, but this trip I will be flying alone with lo. I jut think the battery pack will be more versatile but I have read that the suction is not as strong.