Unfortunately I don't really yet have the experience to design any non-crude way to make a boost converter. However, if you look online there are tons of 4 volts to 12 volts boost converters that can take a Lipo voltage up to 12 V (you'll still need the lipo protection circuitry). Here's one:
Thanks mehn ur the best i too am also a learner and i thank u for being so helpful
Thanks mehn ur the best i too am also a learner and i thank u for being so helpful