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“Compatible” describes whether it works. “Required” or “Useful” describes whether you should buy it.
Samsung · Part EB-U2510XUEGUS
Samsung lists a 25W portable battery for Galaxy S25-series phones; EB-U2510 provides USB-C wired output and wireless charging.
Use the USB-C output for the most reliable fast charging; wireless charging speed varies by alignment and case.
Samsung · Part EB-P4520XUEGUS
Samsung lists a 45W portable battery for Galaxy S25-series phones; EB-P4520 supplies USB-C Power Delivery from a 20,000mAh pack.
The phone negotiates its own supported charging rate; the pack's 45W rating is a maximum shared output.
Open the evidence, limitations, and model identity for a single accessory.