Need owners manual for Yamaha EDY 6500 generator

I have searched but cannot actually find what type male of battery it uses, other than it is a Lead Acid Battery. Now with lead Acid batteries, it is the actual Capacity, in Both Amperage output, and Physical capacity. So based upon that ANY 12 V DC Wet Cell battery of the SAME Physical size, and CURRENT capacity will work. Look on the actual battery itself, it WILL/Should have identifying marks written on it. Get one the same, it is NOT all that critical.

ONANS ARE PRETTY QUIRKY AS IT IS NOT CONSUMER FRIENDLY. THE GENSET IS DESIGNED FOR ROUTINE AND SIMPLE MAINTENANCE PERFORMED BY THE OWNER, AFTER THAT, U WILL NEED TO TAKE IT TO THE NEAREST DEALER OR CUMMINS DIESEL REPAIR SHOP.