I left the ignition on and the battery went dead. now the battery wont hold a charge. i can charge overnight starts right away. ride for 30 mins. turn off and it wont restart.

Question edited for clarity.
Question moved from Cars and Trucks.

Lithium Ion batteries are not suitable for motorcycles despite what it says on the label and advertising. The Scotty Kilmer YouTube Channel did a video on it 2 says ago! The technology is different the maker did not design the electronics and the computer for Lithium Ion.

So what does your mechanic think is wrong ? Battery dies overnight while sitting or when driving the battery goes dead ? Two different problems . Going dead overnight means there is a parasitic drain on the battery . ( something is staying on ) Going dead while driving means the alternator isn't charging the battery .

Never seen that before. But charge battery and try reset your computer by disconnect ing battery wait 2 min and re conect computer may dav gotten spike while boosting

Check the fuses. You might have blown one of them while charging the battery.

Check your bridge rectifier for a bad diode leaking power to ground.

check fuses ( main fuse engine fuse ignition fuse )

recheck all the battery and wire connections, take the volt meter with you next ride, to check the bat voltage if it stops again.
The stator can develop a layer short, which can be intermittant due to heat and vibration.

It is probably the battery, as it does charge up, means the regulator is working, but wont hold the charge overnight means battery.
If you ride it when the battery completely dies and shorts out, this may damage the regulator\rectifier, so make sure it has a good battery.

hi its rob sounds like ur battery needs changed when a battery is left to go flat the cells start to buckle each cell is two volts if u loose just one of these the battery will not hold its chardge.sometimes u can get intermited chardge were it will be ok one minute and the i will just dye the next

try checking the main relay under the dash