Amazon.com: Lithium Ion Battery Compatible Regulator Rectifier 14-117 for 1978-1981 Honda CX500 models Replaces # 31600-460-731 & 31600-426-000 - Made in USA : Automotive
Antigravity battery and charging system | Honda CX 500 Forum
BikeMaster Honda CX500/C/D Custom/Deluxe 78-82 Lithium Ion 2.0 Battery