Starting problem, need help

[AustinF19]

So i have a 95 katana 750. the problem im having is it is hard to start sometimes, and then once i have been riding for a few minutes, stop somewhere and shut it off, it does not want to start back up, 3 times i have stoppedat home for 5 minutes, walked back out to leave and the bike would not start. also i can only use the start for 10 to 15 seconds before the battery is dead (dont know if that is normal) the bike had a new battery,oil,spark plugs, carbs re tuned and some other maintnence done last fall from my uncle and i bought the bike a month ago. anyone know what the problem could be??

Also i do know when i first got the bike i left the ignion on the P position insted of off by mistake, the tail light was on all night and killed the battery before i even rode it once. i charged it and it did run good for the first few days after. then the problems started happening

[05RedKat600]

Provided that while running your charging system is putting out around 14 volts, I'd say bad battery. The only able to crank for 10-15 seconds is the clue there.

[AustinF19]

that is what i am starting to think. i did notice after i had the bike charging for around 4 hours it started right up vs the usual few seconds to start

[05RedKat600]

May want to check the fluid levels in the battery and top it off. Charging it boils the fluid off, and running them completely dead is hard on them.