I've only had the battery for a few weeks but seems promising. I installed into a small HarborFreight tool case and wired it up to 12V cigarette style outlet. I used it to power my Resmed Air Sense 10 cpap while camping. With the humidifier & heated hose turned off (My pressure range is 7-14), it ran the battery from full down to 87% after one night. That was roughly an 8 hour runtime. It's light weight (especially compared to a deep cycle battery) and the price was right.