I have a Civic which I don't drive often and mostly sits in my building's underground parking.
The battery has again discharged on me. While I have jumper cables and know how to use them, I have to sit around until someone walks by and is willing to help me out.
To be able to fix this, and future cases, on my own, I was looking at LiOn battery jump starters, like say a GOOLOO 800A or NOCO Genius GB40. They seem like just the solution, but, for pretty much all brands and models, not just these two, no matter how high the average rating, there is always a very sizable set of 1 Star reviews which basically say some variation of:
It worked fine at first but now it won't charge anymore and is useless.
These devices start at $80 and go up from there. Is there a systemic problem with them, where they just are not fit for purpose and are just a bad idea? I am worried that the high reviews are from people who only used them once or even never used them. It doesn't help my trust either that some have gimmicks attached like pumps to inflate air mattresses.
My use case is not prioritized to a device that needs to hold a charge for a long time and that I can keep in the trunk to boost the battery. It is important however that the capacity to get charged, then boost the car right after, lasts for 2-5 years at least.
Is this category of battery boosters just useless in general and should I instead look for a device where I unhook the battery, bring it up to my apartment and recharge it using some mains-to-battery charger? What are those called?