Turbo Como 5.0 2020 - USB Port

I was surprised to learn after buying my Como 5.0 that Specialized did away with an auxiliary USB charging port. A charging port is very useful for keeping your phone going while listening g to music and running a mapping application. Has anyone solved this problem by somehow adding a charging port?Additionally, does anyone know how to add a battery extender to the Como 5.0? I did a 35 mile ride recently and dropped below 25% power reserve. A range extender would be great and a good option to purchasing a second Como 605 W battery. For instance, I already own a new 36v 13aH battery for a 500w motor, it would be a simple matter to adapt a Como magnetic charging plug and plug it in. Does anyone know if this would safely transfer charge to the Como battery?
For instance, I already own a new 36v 13aH battery for a 500w motor, it would be a simple matter to adapt a Como magnetic charging plug and plug it in. Does anyone know if this would safely transfer charge to the Como battery

The battery has electronics dedicated to avoiding battery overheating or fires/explosions, and only works safely with the included charger.
 
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