Because I used to leave my car unused for extended periods of time (couple of weeks), the battery can't remain unused 3 days without dying. And using jumper cables everytime is difficult. I bought a solar trickle charger but didn't work in keeping it alive, it gave it 13 volts when there was sunlight from what I measured. Since I park it on the street it will be hard to use a battery charger or maintainer because no outlets nearby I think.
This battery I only got 6 months ago because the one before had the same problem. The car is small, so it's a small battery.