Batteries are isolated to protect sensitive electronics from voltage sags and spikes
**The maximum current a switch is designed to conduct for an indefinite period.
***The maximum amount of current a switch is designed to carry for a minimum of a designated period of time.
****As a safety feature, some ACRs prevent combining into a severely discharge battery. A dual-sensing ACR will monitor the voltage on both batteries and will not connect if either battery is below the undervoltage lockout level. Use caution when combining into a battery with extremely low voltage, because this might represent a faulty battery or a problem elsewhere in the system.