There’s nothing on the market like the Omni 20 USB-C (go.macworld.com/om20), a sturdy and well-designed charging pack that has a 73 watt-hour (Wh)/20100 mill ampere hour (mAh) capacity.
Unfortunately, its particular set of features mean it works best for a specific set of users instead of most laptop owners with USB-C charging ports.
Its feature list is quite long. The Omni pack has two USB-C and two USB Type-A ports. It can output 100 watts total from its two USB-C ports simultaneously (max 60W from each one) via Power Delivery (PD) 2.0 support, and recharge its internal batteries at a maximum of 45W total from either port or both ports at once. It also can push up to 15W from both its Type-A ports and at the same time.
That high rate of output from USB-C means it can keep most MacBook Pro models (except the highest-end model) always charging at full speed while they’re in use, as if they were plugged into AC power. And being able to charge two laptops at once at nearly full-speed rates is a bonus not found elsewhere.
The company says the battery recharges in three hours. The math may seem wrong when you take its 73Wh capacity and divide it by 45W, but lithiumion batteries have to slow down charging as they reach capacity to avoid overcharging. In testing, I confirmed that recharge performance. Remarkably and uniquely, it can recharge over USB-C while also charging another device.
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Denne historien er fra July 2018-utgaven av Macworld.
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