you sir have been got... contact sonic about it i stopped ordering from them after they sent me a empty envelope that was suppose to have my terminals for my XS battery in it
http://www.sonicelectronix.com/item_7324_Kinetik-HC600-KHC600.html
http://www.sonicelectronix.com/item_38795_Kinetik-HC600B-KHC600B.html
You get what you pay for my guess is you tried to go the cheap route ^ after doing a quick google this is what i found about the bat you actually got
"This UB12180 is a sealed lead-acid (SLA) absorbed glass mat (AGM) rechargeable battery. AGM and GEL batteries are lead-acid and of the same battery chemistry (lead-oxide, lead sponge, and sulfuric acid electrolyte), but the electrolyte is stabilized differently. In AGM batteries, the electrolyte is suspended in fiberglass mat separators which act as absorbent sponges. This battery comes already charged, sealed, maintenance free, and ready to install. Premium quality absorbed glass mat technology (AGM) is ideal for ATVs, motorcycles, personal watercraft, snowmobiles, UPS systems, alarm systems, exit lighting systems, wheelchairs and more." -nextag