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I've got an x280 that came with 65W charger. It's marked on the sticker to accept 20V @ 2.25A/3.25A (45W/65W).
I've charged it with my HP adapter that only does 15V @ 3A. I also have a RAVPower 45W battery with PD 3.0. It does the power negotiation fine, but I typically only get 19V @ 1.3-1.8A (25-35W).
I was really looking for the 20V output when I was shopping because the thinkpad claimed that, but lenovo's implementation seems to be happy to work with what it can negotiate.
Generally stick with reasonable brands and be careful about using cheap type C cables in charging applications. The 'Power Delivery' standard takes care of negotiating the right amount of power so you should fine with any battery that implements the spec.
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Any idea if this charger will work for this power block?