A power delivery system, comprising: a battery connection ; and a soft-start circuit connected to the battery connection and a main power bus , wherein the soft-start circuit is configured to: provide increasing levels of power to the main power bus when a battery having a voltage level higher than a voltage level on the main power bus is connected to the battery connection , and prevent power delivery to the main power bus from the battery when the voltage level of the battery is less than the voltage level on the main power bus , wherein the soft start circuit includes an output transistor , and the provision of power to the main power bus is through the output transistor , characterised in that the soft start circuit further comprises an operational amplifier and a governance transistor , and in that the battery connection is wired to a first input of the operational amplifier , the power bus is wired to a second input of the operational amplifier , the output of the operational amplifier is wired to a gate of the governance transistor , and a drain of the governance transistor is wired to the gate of the output transistor . a battery connection ; and a soft-start circuit connected to the battery connection and a main power bus , wherein the soft-start circuit is configured to: provide increasing levels of power to the main power bus when a battery having a voltage level higher than a voltage level on the main power bus is connected to the battery connection , and prevent power delivery to the main power bus from the battery when the voltage level of the battery is less than the voltage level on the main power bus , wherein the soft start circuit includes an output transistor , and the provision of power to the main power bus is through the output transistor , characterised in that the soft start circuit further comprises an operational amplifier and a governance transistor , and in that the battery connection is wired to a first input of the operational amplifier , the power bus is wired to a second input of the operational amplifier , the output of the operational amplifier is wired to a gate of the governance transistor , and a drain of the governance transistor is wired to the gate of the output transistor . provide increasing levels of power to the main power bus when a battery having a voltage level higher than a voltage level on the main power bus is connected to the battery connection , and prevent power delivery to the main power bus from the battery when the voltage level of the battery is less than the voltage level on the main power bus , wherein the soft start circuit includes an output transistor , and the provision of power to the main power bus is through the output transistor , characterised in that the soft start circuit further comprises an operational amplifier and a governance transistor , and in that the battery connection is wired to a first input of the operational amplifier , the power bus is wired to a second input of the operational amplifier , the output of the operational amplifier is wired to a gate of the governance transistor , and a drain of the governance transistor is wired to the gate of the output transistor . <EOS>