Signal quality dependent throttling of devices for reducing electromagnetic interference

The activity of a charging accessory device, coupled to a computing device, is limited or throttled in order to reduce electromagnetic interference (EMI) and improve signal quality (QoS) of a wireless communication that the computing device is conducting. The charging activity is limited when the quality of service (QoS) is less than a threshold QoS. In some embodiments, a decision to throttle the charging activity may also be based on battery charge level of the computing device. For example, the charging accessory device may be configured to provide power to the computing device when a power outlet is not immediately available. If the signal quality (QoS) of a phone call from the computing device is diminished or the user is in an area of low signal coverage, the accessory battery charger can be limited or throttled in order to prevent interference (EMI) between the accessory battery charger and computing device.