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Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers to reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit. A voltage spike into the reference pin of a voltage regulator could cause a temporary unregulated condition. If the spikes are averaged into the regulator control circuit they might cause an offset to the output voltage.

Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers to reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit. A voltage spike into the reference pin of a voltage regulator could cause a temporary unregulated condition. If the spikes are being averaged into the regulator control circuit they might cause an offset to the output voltage.

A large bypass capacitor from the top of the H-bridge (+V) to the bottom (GND) will also help reduce voltage spikes.

Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers. This will greatly reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit. A voltage spike into the reference pin of a voltage regulator could cause a temporary unregulated condition (a higher or lower output).

Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers to reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit. A voltage spike into the reference pin of a voltage regulator could cause a temporary unregulated condition. If the spikes are averaged into the regulator control circuit they might cause an offset to the output voltage.

Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers. This will greatly reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit.

Assuming you are using transistor H-bridges, place opposing diodes across the CE points of your H-Bridge drivers. This will greatly reduce the voltage spikes from the motors. See example at: http://www.robotroom.com/BipolarHBridge.html

It is unlikely that large spikes are reaching all the way back to the Li battery terminals, but spikes could cause uncontrolled behavior of rest of your circuit. A voltage spike into the reference pin of a voltage regulator could cause a temporary unregulated condition (a higher or lower output).