Manual Battery Switches Automatic Charging Relays Add-A-Battery Kits

Mini Add-A-Battery Kit - 65A


The ADD-A-BATTERY is as simple to operate as an ON-OFF switch, yet effectively manages the switching and charging of two batteries from a single charge source

The Add-A-Battery includes a Dual Circuit Plus™ Battery Switch and an Automatic Charging Relay. These components simplify switching and automate charging, so that all you have to do is turn the battery switch ON when you arrive and OFF when you leave.

Dual Circuit Plus™ Battery Switch

  • Simplifies switching
  • Isolates engine and house circuits
  • Combines batteries for emergency starting
  • Tin-plated copper studs for maximum conductivity and corrosion resistance

ACR Automatic Charging Relay

  • Automatically combines batteries during charging
  • Isolates batteries during engine cranking and when not charging
  • Shares the charge between two batteries more efficiently than a battery isolator
  • Allows efficient dual battery charging without needing regulator adjustment or rewiring

MSRP: $137.99
Where to Buy Find a TECH Installer Compare

Frequently Asked Questions

Q: Can I ground to the chassis when installing in a vehicle?

Run the negative wire for the ACR directly to the battery negative terminal of one of the batteries. A chassis ground is often insufficient to allow proper operation.

Q: Do the battery switches switch the negative?

In most cases no. The most common battery systems switch the positives and bus the negatives

Q: Can I use battery protectant on my Blue Sea Systems Battery Switch and if so, what type?

Yes, a marine grade protectant applied according to its instructions is acceptable.

Q: Do I need a ground wire for the ACR?

Yes, the ACR is an electronic device and needs the ground wire in order to operate. The instructions show an optional switch in the ground wire however the wire is not optional.

Q: Which Add-A-Battery Kit do I need?

For engines with charging systems up to 65 amps, the 7649. For engines with charging systems up to 120 amps, the 7650.

Can't find your answer?

Contact Tech Support
NoticeYou have cookies disabled. — requires cookies to provide you full functionality. Many features of the site will not function until cookies are enabled. — Read Privacy Policy
NoticeYou are using an outdated browser. — can not guarantee 100% compatability with your browser — Upgrade your browser