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What to do after killing the battery I have an MT-125…

What to do after killing the battery

I have an MT-125 (2025), and yesterday I forgot the key in the ignition for a few hours (at a friend's garage).

I then understandably found the bike completely unresponsive so I bump started it and got back home, hoping the alternator would at least charge the battery back up a little bit. On the contrary, the bike completely died 100ft from my home and couldn't stay on even after push starting.

I immediately plugged the battery to a charger and left it to charge overnight, this morning it's at 13.3V and fairly warm, so I tried turning the bike on again. It doesn't really work still, the symptoms are:
- the dash doesn't turn on until the engine is running, but daylight running lights and the brake light turn on
- the engine cranks normally, but when it's running the check engine light is on
- throttle is quite sluggish

So, here are my questions:
- I don't have experience with charging lead acid/gel batteries, do I let it charge another few hours? I unplugged it to let it cool down and to see if the bike would behave. I'm planning to get a new battery, but I have to decide if I can commute with the bike tomorrow or not lol
- is 13.3v considered "low voltage" for Yamahas? I thought it's almost normal voltage.

Oh, I have not ridden the bike again yet, I just cranked the engine to see if it would run now. Battery has been charged for about 8 hours.
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