About this product

This is a rear back body casing (battery door housing) built specifically for the Realme C21Y, sold in Black to match the phone's Cross Black finish. The Realme C21Y carries a plastic back with a plastic frame, so this replacement panel is molded from the same class of material to sit flush against the 164.5 x 76.0 x 9.1mm chassis without adding noticeable bulk. It exists for one job: replacing a cracked, scratched, or lost original back door on a phone that carries a 5000mAh battery sealed under a non-removable rear panel, where the housing itself is often the only external casing option since the C21Y has no separate bumper-style case ecosystem tied to a metal frame.

Cutout aligned to the C21Y's triple rear camera array (13MP + 2MP + 2MP)
Port opening matched to the Micro-USB charging port position
Headphone jack cutout preserved (the C21Y retains a 3.5mm jack)
Access cutout for the dedicated microSD card slot on the side frame
Molded to the original 9.1mm body thickness and 200g weight balance
Finished in Black to match the Cross Black colorway

How it fits your Realme C21Y

Because the C21Y measures 164.5 x 76.0 x 9.1mm and weighs 200g with an all-plastic back and frame, this housing is dimensioned to the same shell rather than a generic "one size" cutout — the camera window lines up with the vertical triple-lens array (13MP main, 2MP, 2MP) rather than a single-lens or dual-lens layout, so it will not sit right on a phone with a different camera bump. The charging cutout is positioned for a Micro-USB port, not USB-C, which matters because the C21Y still uses Micro-USB at 10W wired charging — fitting this panel to a USB-C Realme model would leave the port cutout misaligned. Side button openings are cut for the volume rocker and power key positions on the plastic frame, and the top edge cutout clears the 3.5mm headphone jack. This is strictly a back housing, so it has no interaction with the 6.5-inch IPS LCD display (1600x720, 60Hz) on the front — it protects and covers the rear shell only, not the screen.

What you should know

This housing is confirmed for the Realme C21Y specifically — it is not interchangeable with the Realme C21, C25, C25Y, C25s, or C11 (2021), even though these share a similar naming pattern and design language, because camera module shapes and port placements differ across that lineup. This is a cosmetic and structural back panel replacement: it restores the outer shell and gives the phone a clean, unbroken back, but it does not include the battery, camera module, motherboard, or any internal electronics — those remain the original components transferred over from the old housing. Fitting a new back door means opening the device and disconnecting the battery connector, which can affect the manufacturer's warranty if the phone is still covered, and because the C21Y's 5000mAh battery sits directly beneath this panel, we recommend professional installation rather than a DIY attempt if you are not experienced with phone disassembly — mishandling a battery during removal carries real risk. Note also that this listing covers the Black variant only; if your unit is the Cross Blue color, this panel will not be a color match.

Buying with confidence

Dastyab.pk offers a 7-day return window on unused, unopened items if this housing doesn't match your Realme C21Y as expected, and we deliver across Pakistan. This listing is written against the C21Y's actual published specifications rather than generic template copy, so what you read here is what you should expect to receive.