Reddit reviews KMG 12V Battery for Honda 750 VT750RS C2B 2010-2011 YTZ14S Sealed Maintenance Free Battery High Performance 12V SMF Replacement Powersport Battery
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Battery Family: High Performance, Sealed Maintenance Free (SMF)Voltage: 12 VoltsPolarity: [ + ]--------[ - ]Brand: KMG | Battery Type Number: YTZ14SDimensions: 151mm x 87mm x 110mm
How old is the battery? If the bike was unloved, did the previous owner take care of the battery? If it still has the old T battery, replace it with this:
https://www.amazon.ca/Maintenace-Performance-Replacement-Maintenance-KMG/dp/B00JH25PTI/ref=sr_1_cc_5?s=aps&ie=UTF8&qid=1472430443&sr=1-5-catcorr&keywords=ytz14s
I put one in my 1985 vt750 and it has worked great so far (~10,000 km). If you're hesitant to buy a new battery, take the old one out and test it...put it on a trickle charge for a few days and slap it back in the bike and see if the instrument panel lights up...if not, time to grab a multimeter and start tracing wires.
You'll also want to grab the Honda Service manual from here, chapter 18 has some stuff on troubleshooting electrical/charging problems:
http://www.mediafire.com/file/w6ygxyc023fo95i/vt750c__.pdf