Hi, have had this truck since new, it's currently got 87K miles on her. 2006 Chevy Silverado LT 2500HD 4x4 8.1L Gas. It's got the OE dual battery set up. The second battery that's on the back passenger side compartment of the engine consistently leaks. I've replaced it 3 times so far, bought the first replacement set, and then returned the secondary battery under warranty twice so far, the last time about two months ago and now the new battery is leaking like a sieve. Bosch batteries from Pep Boys. I've tested the batteries while running and the front drivers side battery, which I assume is the main, is always fine at 14Volts and is perfect and never leaks. This new leaking secondary battery in the back left passenger side is reading 12 volts. As stated earlier, I've had to replace this secondary battery 3 times so far because of leaking excessively. The only extra hooks ups I have is a Memphis amp powering 4 door speakers and that's ran off of the front battery, which never has any issues. No other accessories hooked up to this secondary battery, no snow plows or lights, just the OE factory wiring since new. Is this secondary battery "cooking" or something? Last time I replaced it under warranty is appeared very hot (during summer months) and appeared swollen and leaking. But never any problems with main front battery, ever, only pain in the neck back secondary battery. I hope I've listed all pertinent info. Does anyone have any idea what the issue could be? Thanks in advance for any help!