You should be able to physically fit a lipo battery into the car, but you need to be careful when driving the car to ensure you don't run the battery too low.
The lipo batteries have a certain point at which they will not take a charge if you use them for too long. This is why the expensive electronics have a "cut-off" feature which helps prevent the battery charge from becoming too low.
My recommendation for batteries is to get one or two of the Reedy Wolfpack battery packs. they aren't lipo, so you don't have to worry about killing the batteries if you drive for a long time. Plus, they are cheap and should
As for your car, it's a bit uncommon, so upgrades may be hard to find. Once you spend enough time learning to drive your car and saved up a bit of money, I would recommend getting a car from one of the more common companies like Tamiya or HPI. That way you can get upgrade parts easily and there are people on this forum who can help you out with stuff like car setup.
I hope this helps. Have fun.
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