Custom dmg advice needed

I am making a custom dmg and I need help. I have fitted a 3.7 volt mobile phone battery and plug to charge. Charging all works etc. problem is I don't know if I can Run a backlight on 3.7 volts and where to wire it. The power led cant even run brightly at this voltage. Hope I can fit a backlight. Thanks for any help :tophat:
 
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