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ADP5091 BACK_UP pin and cold start

Hi,

In my ADP5091 design I have grounded BACK_UP and SETBK. However this means that on a cold start, even with a full battery, there needs to be some power on VIN to charge SYS using the cold start pump.

Is it safe to connect BACK_UP to BAT (and connect SETBK to AGND) to allow the ADP5091 to draw power from the battery during the cold start? I just need switch S1 in the datasheet to turn on and don't need any other backup features.

Thanks in advance!