The 4386 circuit board has 4 terminals. Two terminals labeled "CHARGE" connect to the battery via a 14 amp polyfuse. Two terminals labeled "LOAD" connect to the battery via a 5 amp polyfuse.
Compatible with the 84 A h battery that comes with the BP84 and PS84 (CSI PN25962). It may be compatible with other batteries but that will depend on the style of the battery terminals.