Tech review: Can Tesla batteries power your phone? | Technology

If you’re a regular reader of this column, you already know that I’m a battery geek.Being prepared with my own power supply makes me much less likely to be caught with a dead phone battery when I’m away from a plug.When I travel, I carry a small wall charger, but lately I’ve been trying to make it through a whole weekend with just a nice-sized external battery.A battery that can power a laptop, a phone (or two) and an Apple watch is heavier to take with me than a charger and a few cables, but I like having my own power source.This week, I’m reviewing a new external battery that has more power output than any portable battery I’ve used before, the Chargeasap Flash Pro ($299.99 at chargeasap.com), which can provide up to 190 watts of power.This…

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