Canon LP-E17 Rechargeable Lithium-Ion Battery Pack, 1040mAh, 7.2V

The RF-mount EOS R50, R100, R10, R8 and RP, the Rebel SL2, SL3, T6i, T7i and T8i, the EOS 77D, and the EOS M3, M5 and M6 series. It does not fit the LP-E6 bodies such as the R6 or 90D.

No, the pack is sold on its own with its terminal cover. It uses the Canon LC-E17 charger, which comes in most camera kits, or you can charge it inside a body that supports USB power delivery.

The genuine cell is the one the camera can interrogate, so you get a percentage readout and a recharge-performance rating instead of a rough bar gauge. Some bodies also warn or refuse to charge unrecognised packs in-camera.

Canon's CIPA figures are about 230 frames through the viewfinder and 310 on the rear screen. Video runs it down faster, so a second pack covers a full day of mixed shooting.

Yes. At roughly 7.5 watt-hours it is far below the 100Wh airline limit, but spares must travel in carry-on with the terminals covered, not in checked luggage.