I am building a battery backup system for a DC appliance that runs on 6V.
I have a 6V sealed lead acid battery to serve as the backup source.
However I read that a lead acid battery at full charge has slightly more voltage than its rated at. E.g. a full charge lead acid 6V battery would rest at 7.15V
At this voltage it would be damaging for the appliance so a voltage regulator is desirable.
However many voltage regulators like LM317 give a drop of about 1.5V. So, at full charge the battery's 7.15V would get regulated to 5.65V which is lower than the required 6V. Not to mention it would drop more as the battery discharges.
I'd also wish to put a transistor switch between the battery and the appliance to turn it off when battery is discharged to prevent a deep discharge. Again that would lead to some voltage drop.
What is the best regulator and switch to use in this scenario? A Zener diode?