The load meter will give you a clue as to the health of the battery , the volt drop during start on some engines can be a limit and too big a drop might indicate time to replace the battery or abort the start as it may not be enough power left in the battery to do a healthy start on some turbines .
Batteries can be expensive , but replacing them before they get too weak can save expensive wear on other parts .
Cold can kill a battery , left to long in the cold and it may need charging . Never leave a battery on a cold concrete floor , it will kill it .
Paying attention during a start can tell you a lot about what is happening to your engine and accessories .