NEW DELHI: The realme C100x can reverse charge another compatible device at up to 6W, according to its official India page. Realme requires USB OTG and a compatible USB-C to USB-C cable. The much larger 45W figure advertised for charging the C100x itself describes a different direction of power flow.
| Charging task | Official figure or requirement |
|---|---|
| Power sent to another device | Up to 6W reverse charging |
| Reverse-charging connection | USB OTG and compatible USB-C to USB-C cable |
| Maximum SUPERVOOC input | 45W |
| Other listed input compatibility | 45W PPS, 15W PD, 15W VOOC, 13.5W QC |
| Battery capacity | 8000mAh typical, 7780mAh rated |
Start with the direction of charging
Think of the C100x as the source when it supplies power to an accessory or another handset. When connected to a wall adapter to refill its own battery, it is the receiving device. Keeping those situations separate prevents the input specification from being mistaken for the output available to something plugged into the phone.
That distinction matters in a household sharing chargers and cables. A cable used to refill the C100x is not evidence that an intended reverse-charging setup meets the published requirements. Check the connectors and the receiving device's compatibility before relying on the feature away from a power socket.
The official product-page footnote says reverse-charging compatibility depends on the connected equipment and OTG output performance. It recommends official realme USB-C cables. The statement does not promise that every device with a matching socket will accept power at the maximum rate.
Make a controlled compatibility check
Use a compatible cable with the specified connectors, then check the receiving device for its charging indication. Establish that the intended device is actually receiving power before treating the setup as ready for a journey. This is a practical compatibility check, rather than a claim that a particular charging animation or menu appears on every receiving device.
If charging does not start, return to the requirements: the C100x's OTG capability, the cable and the equipment being charged. Avoid treating the absence of a charging indication as proof that the phone's battery is defective. The published compatibility qualification leaves room for a connection that simply does not work with the intended equipment.
Realme confirms USB OTG support and a USB Type-C interface in the C100x specification sheet. The pages reviewed do not provide a universal step-by-step menu path for activating reverse charging. Owners should use the instructions present on their handset rather than copy a setting sequence written for another model.
What to expect from the output limit
The reverse-charging ceiling is useful as a boundary, not a stopwatch. It does not establish how long a particular pair of earphones or a second phone will take to refill. The receiving battery's state and the equipment's compatibility remain part of the situation. No accessory-specific charging time is published in the material reviewed.
For someone carrying the C100x during a long commute, the feature is best understood as an additional way to share available energy. Planning to supply another device also means deciding how much charge to retain for the C100x's own calls and messages. Its large battery specification does not remove that practical allocation question.
The source phone's remaining percentage and the receiver's charging indication are different pieces of information. Observing both gives a clearer picture of whether the arrangement is doing what the owner intended. A cable connection alone does not answer that question, particularly when the manufacturer explicitly qualifies compatibility.
The C100x also lists a 3.5mm headphone jack. That is a separate physical connection to keep in mind when arranging a wired setup around the phone. The reverse-charging requirement still specifies the USB-C connection; an audio socket does not provide an alternative route for the documented power-sharing feature.
Read the wall-charging list separately
The input table makes another model-specific point: realme lists different protocol limits for the C100x. A charger described only by a large wattage on its casing does not identify which of those protocols the connection will use. Match the supported protocol as well as the connector when interpreting the official input specification.
Our realme 16 Pro 5G price list: Rs 44,999 to Rs 62,999 and realme C85 5G price: Rs 21,999 in both colours examine other models' charging qualifications. The realme GT 8 Pro vs GT 7T price: GT 7T starts lower at Rs 39,999 is another useful example. None supplies a charging-time promise for the C100x.
For this handset, the verified answer remains precise: power sharing is specified at up to 6W with OTG and a compatible USB-C cable connection. Keep that output description alongside, but separate from, the supported wall-charging protocols.
Official sources: realme C100x product page and India specifications, checked on 7 November 2026.
