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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