The C rating multiplied by capacity gives you your maximum discharge current. At the moment you have 5A (5000mah) x 25C = 125A
What amperage is your speedo rated at?
In 2 wd I currently use a speed passion LPF speedo which if I remember rightly has an 80A continuous discharge rating. The lipo I'm using is 3600mah x 35C= 126A so more than sufficient. Whilst you are only running lower power motors you should not need larger capacity cells unless you specifically want the extra weight to balance the car.
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