Sorry , You right I'm just downloaded a pic of the motherboard, that is the connector of the battery, as i said try to connect a dc power supply 3volts.
!. first one positive of the power suply to positive of the motherboar and negative of the power supply to negative of the motherboard.
2 the do the same but, positive of the power supply to neagative off the power supply, and negative of the power supply to positive of the motherboard.
ISAID JUST A 1 OR 2 SECONDS.