How old is the battery (you didn't mention)...
They are rated as 2yr, 3yr, 5yr etc... And as they get older, they perform worse...
What I mean is that the cold cranking amps tend to drop as they age, making it harder to do multiple crank starts...
This gets worse if there are loose connections, cold weather or if the sediment inside the battery builds up (as it does when it ages) and shorts out a cell or two, thus reducing the battery's amperage capacity.
Also, it is important to have the correct battery for your car installed... I so often see cars where the wrong battery is installed... Physically it fits, the posts are the correct type and on the correct side of the battery BUT the battery rating is generally to light for the requirements of the vehicle (ie: someone replaced it and bought the cheapest one on the shelf...) and make no mistake, auto repair shops and car dealers do this too!
Have the battery checked at a reliable auto parts store for free... They will check your alternator as well...
And if the battery is near, at, or past it's year rating, change it.
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