Handheld charging quirks: why some won't charge from a USB-C fast charger
Some handhelds — most famously Anbernic's RG-series — won't charge properly from a modern USB-C fast charger. Here's why that happens, how to tell if your device is affected, and the simplest fix.
The problem
Many budget handhelds use a simple 5-volt charging circuit that doesn't speak USB Power Delivery (USB-PD) — the fast-charging standard used by modern phone and laptop chargers. Plug one of these handhelds into a USB-C PD or GaN charger and it may charge extremely slowly, only while powered off, or not at all — sometimes showing a charging light while the battery never fills.
Why it happens
A USB-C PD charger only delivers a trickle of power until the device formally requests more over the PD protocol. These handhelds never make that request. Worse, on several models (notably the Anbernic RG35XX family) the USB-C port is missing the small CC pull-down resistors that tell a charger “I'm a device that needs power.” A high-quality E-marked USB-C-to-C cable can make it worse, because the charger reads the cable and decides nothing needs charging. The result: a perfectly good charger that refuses to feed the handheld.
How to tell if you're affected
- The battery drains while plugged in during play.
- It only charges when powered off.
- The charge light is on but the percentage doesn't move.
- It charges fine from an old phone charger but not your laptop/GaN brick.
The fix
- Use a basic 5V USB-A charger (an old phone charger, ~5V/2A) with a USB-A-to-C cable. This is the single most reliable fix — A-to-C sidesteps the PD handshake entirely.
- Avoid C-to-C cables with PD/GaN chargers for these devices. If your charger only has USB-C ports, a cheap non-PD 5V wall adapter with an A-to-C cable is the safe bet.
- Charge while powered off to pull full current.
- Try a different, simpler cable — E-marked and charge-only cables can both cause trouble.
- On dual-port devices, check whether only one port charges.
This is normal behaviour for the hardware, not a fault — you usually just need the right charger. Hardware-savvy owners can also add the missing 5.1k Ω CC resistors, but that's an advanced mod and not necessary for most people.
Devices with a known charging quirk (13)
Pulled live from our database — open any device for its exact charging notes.
