what is with Crafts that run out of battery Spinning while accelerating

@Toinkove it was the simplebeast stock craft

Could be many reasons for this: would help to see the craft in question but….
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If you have a gyroscope in the craft, it will of course try to keep the heading locked during a burn. This will use battery power so you need to make sure you have enough battery (and a way to recharge it) so it does not run out. If the batteries were to run out of power in this situation the gyro will cease operating and a spin could ensue.
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Also sounds like maybe your center of thrust (CoT) and center of mass (CoM) might not be aligned well enough. When CoT and CoM are not aligned this will cause the craft to point a few degrees off from where it should be pointed during the burn (and lead to less accurate burns). It probibly is possible to have those two so out of line that even a gyro will not be able keep the craft pointed in a steady direction and the craft begins to tumble (or as previously stated if the gyro runs out of power) Agian we’d really need to see this craft to diagnose the issue but there’s a starting point.