After I left home yesterday my wife called saying she’d left her car door open all weekend and the battery(s) were dead. She called AAA, they started the car and she kept it running for another 1/2 hour until time for her appointment. I wasn’t sure the battery would have sufficient charge to start after her appointment so I bought 750 A fairly hefty device at Walmart and plugged it in at the place of her appointment. Going forward, I will return the jumper and get her a small lithium ion device she can keep in the car and is manageable.
I searched and found a ton of devices. I’m leaning toward “the Aickar 800A Peak 19800mAh Car Jump Starter” for its safety features. It’s the only one I’ve come across that will override/not allow you connect the terminals incorrectly which could be a real possibility.