must be, that poor battery
oh well, dont come crying to me when your poor battery has cold cranked your engine 30 times a day and now in under 3 years time you need to buy a new one Unless there is a massive spring that coils up when engine is driving so that when you stop and wanna start again the coil springs your motor back into action and therefore doesnt need a startr motor anymore
as mentioned before, 2 cars, both 100 000kms. both 5 yrs. both original batteries/starters... Its a different tech to 90's starter motors/batteries. Some engines even angle the crank to insta-fire on next start (mazda I think).