MacBook has no backlight and only turns on when plugged in

My MacBook was working perfectly and I went to turn it on the next day and now it has no backlight and will only power on if plugged into the charger. Could it be as simple as a battery replacement? I of course can not check the battery health as I have no backlight.

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You can use a flashlight shining into the logo (poor mans backlight) or use an external display via a Thunderbolt or mDP adapter to HDMI or VGA.

For the batt, install this gem of an app! CoconutBattery take a snapshot of the apps main window and post it here for us to see 在已经存在的问题里加入图片