EMB ERJ 145 ER/LR
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Human-Machine Interface; Other / Unknown
Deviation - Altitude Overshoot; Deviation / Discrepancy - Procedural Published Material / Policy
Air Traffic Control Issued Advisory / Alert; Flight Crew Overcame Equipment Problem
Human Factors
I was First Officer/Pilot Monitoring; Captain was Pilot Flying.  We were cleared to 'Descend via the PHLBO3RNAV Arrival.'  Properly briefed by Captain; reviewed by First Officer/Pilot Monitoring.  During descent First Officer/Pilot Monitoring turned off screen of EFB to preserve battery life; on assumption that briefing was done properly; this was a 'Routine operation conducted numerous times in recent past;' info was duplicated in FMS; and Captain was also a more experienced pilot who had a decade more experience than First Officer and 'had the procedure memorized.'  Altitude set to 11;000 [feet] for SOMTO; no issues.  Passing SOMTO; Captain/Pilot Flying set altitude to 7;000 [feet] (as opposed to correct 8;000 [feet]) for DYLIN; and announced '7;000 set.'  I; as First Officer/Pilot Monitoring; responded'7000 SET' and confirmed setting; without noticing error and thus taking corrective action.  We descended to 7000.  No comment from ATC; who handed us off to next Controller.  It was THAT Controller who questioned us about the 7;000 feet altitude; advised that it was 'no big deal' while pointing out we were supposed to be at 8;000 [feet]; and then had us continue descending to 5;000 feet to continue approach to Newark 4R.  Captain and  First Officer debriefed that neither one of us caught the obvious error; and agreed we had been 'conditioned' to expect 7;000 feet from the much more frequently used (by us at least) CRANK at 7;000 feet of the FLOSI3RNAV Arrival from the north. 1;000 feet lower than expected at that portion of the arrival procedure and during ATC hand-off. Do NOT try to stretch battery life of EFB at the expense of being able to properly monitor the situation.  Read the procedure EVERY TIME IN DETAIL; even if it is one which you THINK you are familiar with.
Air carrier flight crew using EFB charts turned off EFB to conserve battery life. During STAR arrival; an altitude was missed and ATC notified the crew of the deviation.