Billet Proof Designs has come to be known as the go-to source for your lithium ion battery charging system requirements. With the partnership of Rick's Motorsport Electrics, we have the products, and know-how to get your old regulator/rectifier ready for a lithium ion battery.Lithium ion batteries don’t like to be charged like a lead acid battery. Lead acid batteries are okay with constant charging or even over-charging, whereas lithium ion batteries will become damaged with over-charging and the ‘topping off’ of voltage. Making sure your charging system is outputting the correct voltage is imperative to a long-lasting and reliable lithium ion battery. We also offer a complete wiring harness that has diagnostic LEDs to help you trouble shoot any wiring issues.