I have 2. One is for a DR Power Grader, the other is to power a Sony portable stereo using a 12v pure sine wave inverter. Power Sonic batteries are very high quality, AGM, and also made for the ability to be OK with deeper discharges. And they last a long time! They cost more, but the end value is much higher than buying cheap batteries a lot more often. 1 Power Sonic battery is 6 years old and still strong, but NOTE; What harms shortens battery life the most is allowing them to sit and slowly discharge, heat discharges them faster. Keep them charged up, like once a month or so in fair weather, and every 2 weeks in hot weather. I don't like using 'battery tenders' because they have a constant power usage, and they get hot. Just use a high quality charger and do a top off charge every now then.
Rating: [5 of 5 Stars!]