DS3231 Real-Time Clock: Battery drains back to Arduino when no power

hi,

i'm building project (garden irrigation system , weather station data logger) uses ds3231 clock provide accurate timing on long period of time.   this ds3231 have.

i particularly wanted use battery-backup facility in clock mains power project removed (like when power-breaker in garden trips out after cut mains cable hedge trimmer when i'm not concentrating - again  ).

however, having set prototype, seems when mains removed project, battery in ds3231 keeps powering arduino (and other stuff, lcd display).  happens minute or until (i guess) battery drained.

have others experienced this?

i thinking should insert diode in vcc supply clock stop draining power uno when there's no mains power connected.  seem sensible?  if so, advice on spec should use diode appreciated.

thanks in advance advice! 

peter

how know backup battery powering arduino when mains power removed?

see this thread lir2032 battery , charging circuit. have several of these zs-042 boards , of lir2032 batteries dead on receipt , rest failed @ later time. have modified of them removing diode , using cr2032 described in thread.

pete

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