I'm not a fan of the lead acid backup batteries for mobile applications, because it's *primary* duty is readiness--keeping a mobile, always-there bank of juice for weeks and months, at-the-ready, and lead acid tech kind of sucks at that.
In fact, the readiness functionality of one of these backup power banks runs counter to the very nature of lead acid batteries. They self-discharge pretty significantly over the course of months. More dramatically in the winter months too. And that leads to deep discharge, which shortens their life. And then people think "what a piece of crap" 9 months later when they actually need it to perform its 2nd duty (actively delivering the stored juice). They find that only a fraction of juice still remains, and whats worse, the oxidation of the lead plates means that it can't be fully charged anymore. They get frustrated, and they chuck out what could have been a useful piece of gear, if it was deployed in a better manner.
In fact, the one exception I have to my distaste for mobile lead battery banks is when it's deployed the smart way--like...for instance...in the manner in which all lead acid batteries are incorporated into cars & RVs.
Paired with a means of recharging, and a charge controller, lead acid batteries can give you good bang for the buck, and if you have a vehicle to carry its weight, who cares that it weighs a ton. Then you don't just have a battery bank, you have a whole system thought out. But aside from RVs, police cars, and tow trucks, I rarely see anyone implementing such an ambitous mod. You never see packs likt that Cat Jump starter sorted out with its own charge controller, & plugged into an onboard alternator for frequent automatic top-ups. But open the hood of tow truck and RVs and sometimes you'll notice that they're equipped with a 2nd battery and even a 2nd alternator (all optional OEM equipment, by the way) under the hood doing exactly that. Those are good mobile 2ndary power sources.
If you do get the jump starter, I recommend you get in the habit of putting a reminder on your calendar maybe every other month...top that sucker up on a fairly frequent routine.