Avoiding damage to universal serial bus sink switch device

An apparatus, comprising:

• a transistor comprising a first terminal coupled to a battery charger and a second terminal coupled to a Universal Serial Bus (USB) port;
• and
• a controller coupled to the battery charger, wherein the controller is to:
• cause the battery charger to limit current through the transistor to a first current limit;
• enable the transistor;
• start a wait period;
• and
• re-enable the transistor in response to a determination during the wait period that an external power source is to provide the power to the USB port in an extended power range.

One or more non-transitory machine-readable storage media having machine readable instructions stored thereon that when executed cause one or more machines to:

• determine that a battery coupled to a battery charger has a charge level below a threshold, wherein the battery charged is coupled to a Universal Serial Bus (USB) port via a switch;
• and
• in response to the determining that the battery has the charge level below the threshold:
• turn on the switch to allow the battery charger to receive power;
• turn off the switch in response to accepting a contract to receive power in a first power range;
• turn on the switch in response to receipt of a first power range ready message;
• turn off the switch in response to accepting a contract to receive power in a second power range which is greater than the first power range;
• and
• turn on the switch in response to receipt of a second power range ready message.