ENG#1 only, battery start procedure setup (leave all systems checks for after start)
Skilled crew can move through the checklist pretty quick, with a good copilot and batteries I could get all the RFM battery start system checks done and still have 23v for the start. With suspect batteries nobody I knew would do any systems checks before a battery start. If it was fine when shut down, then likely so on start - helicopter doesn't know if it is the same day or the next. Also depends if dicking around until below 23v results in sleeping in the back of the helicopter for a couple of days instead of back in your 5 star hotel. 139 always had lower than normal battery voltage, heard of some operators adding an extra 1.5v cel to the battery pack. BTW, I knew of some offshore operations where the pilots have never done a battery start, only GPU, and in fact battery starts were prohibited by ops. Those would never know what condition their battery was in.