SonicElectronix knows quality....Enough said. I ordered the battery for my S-10 as an extra battery for my system. They were the cheapest in product and shipping. The quality of products from Sonic varies. They taylor from beginner to pro, rich to poor and in between. At great prices
I have been a returning customer due to the fact that they always take care of me the customer and to me that matters more than the product I am buying. As far as the battery goes its awesome and has been keeping my amps happy and electrical system steady. I only regret not buying 4 of these instead of one.