i read on the eagletree website that the elogger needs 4.5v minimum either through main leads or a backup battery lead, but what is the minimum voltage it will read when powered throw the backup battery? will it read down to zero volts?

also what batteries have you used for backup battery? the site said 4.8-6.0v but i was hoping to use a 6.6v life battery which supposedly can be as much as 7.2v at full charge.