As you saw last weekend, you need to lengthen your car. The electronics you showed me was fine.
I'm also using china stuff. Doesn't last very long but the time (read: one season max) you need those are fine.
Maybe some last longer than other but my fist rule (tajuaakohan nyrkkisäännön

) is to change batteries every season.
In that way you can always be sure that batteries aren't the weakest stuff in your car.
I've used some small batteries and those have been great. Bigger ones haven't made any impact.