I did quite a bit of research and ended up going with an Antigravity XP-10 and really have had no problems in 2 years and use it quite a bit. It has an adapter for just about anything you want to plug into it. I use it at work when traveling to prolong my laptop battery and cell phone. It’s not the smallest unit out there now days but I found a smoking hot deal for it ($99) and it’s battery reserve matched my needs. They do make smaller ones and from all the reviews I looked at there were very few complaints for this brand. It comes in a nice small carrying case too.
The antigravity xp10 is a great unit. I will vouch for this unit as I have one.nice thing about the xp10 is you can charge multiple things at once on it. I also have the zetec brand one. Both will jump a car. I use mine at work to jump cars often. The zetec is smaller and can be found on amazon.com. I keep one in each vehicle for emergencies and it will hold a charge for 6mo. Both good units