If the LM3914 and its LEDs are powered by the battery being tested then the current is up to about 160mA if all LEDs are on for a fully charged battery.
You could connect the LM3914 in the "dot" mode so that the current is only about 20mA.
Do you want a range of measurement from 6.0V for a discharged battery to 8.4V for a battery directly from the charger?
Or do you want 6.0V to 8.0V with 0.2V between LEDs?