I am facing starting problem on CNG. Contacted battery vendor, after thorough checking, he declared that batter is perectly fine and there is current leakage. Showed to mechanic/auto-electricial, Self was overhaulled, both bush were replaced. Was advised to push clutch while starting. It worked fine for many days with one to two starting efforts. But sometime failed and battery power is gone. After recharge, it works fine. Can someone advise, what may be the real problem now.