I agree with the above comments. We have been using AGM for quite a few years now, on and off, but like anything we buy, "You get what you pay for". AGM are a bit more costly although since i have yet to clean up battery acid in my basement, have not smelled anything, they work well in different positions, they take vibration well, they discharge slow and recharge quick, and the list goes on. The one negative i have is they are heavy, but that is all. I will never go back to lead acid. WE have two 12 volts and never had an issue with running out of power even long over night with heater running on and off all night, recharge in morning with generator within a couple hours. All good for us! ! ! Good Luck & Be Safe ! ! !