Exact machineDo not buy parts from a broad answer.
Your exact machine, year, trim, VIN when needed, charging-system layout, accessory wiring, battery size, battery rating, terminal layout, and the part number are required before treating any battery, regulator, stator, relay, fuse, cable, charger, or accessory wiring as the right fit.
Safety boundaryStop when the answer stops being enough.
Stop and get hands-on help if wiring is hot, fuses repeatedly blow, insulation smells burnt, aftermarket wiring is unclear, or a charger or battery behaves unpredictably.
Deeper pathUTV battery keeps draining guide
This answer links into the deeper guide before Traxer asks for the machine details that make the next step useful.
Read the guideWhy it stops hereHelpful first checks without pretending certainty.
Traxer reviewed this against the related battery-drain, clicks/no-crank, and no-start guides. It gives first battery-drain checks, not a final battery diagnosis or final parts answer.