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Usually for standard battery i use diode ( like 1n4148/1n4001) paralel with its polarity. anoda to minus polarity while katoda to positif polarity....
(+) --
_|_
/\ diode
|
(-) ---
The circuit in revbat.pdf was designed for a device powered from a single 1.5 volts button cell battery. However, the circuit will operate with higher voltages as well.
For battery based application loss and standby current is more importatnt, especially for the mentioned one which has only 3.6 volt with may be small AH. Also I am wondering about this app from maxim, do we have extra power for that circuit!
Yes you are true. In this type of application power lost is importante, and this device current consumption is 0.001uA (typ) and 1uA (max) more leakege current at input pins, but I'm just suggest sollutions. If tcam think that power lost is big for his application he will simply ignore this suggestion.
As Elits said, use a diode.
Instead of an 1N4148 or 1N4001 which have a voltage drop (Forward Vd) of 0.6-0.7 volts, you can use the BAT85 or a simillar one with a lower Vd.
This lead to a lower reverse voltage accross your circuit supply lilnes.
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