About this replacement
Oppo Reno Ace2 — 7.74V Li-Polymer Replacement Battery (BLP783)
This is a 7.74V, 1900mAh Li-Polymer cell built to the BLP783 specification for the Oppo Reno Ace2 (PDHM00). It fits the Reno Ace2 and Reno Ace2 2020 variants. Replace this battery when the original cell can no longer sustain voltage under display or modem load.
- Reno Ace2 / PDHM00 compatibility: All three model designations — Reno Ace2, Ace2 2020, and PDHM00 — share the same battery bay geometry, connector pinout, and BMP communication protocol, which is why one BLP783 cell covers all three.
- Bench tested on actual hardware: We ran this cell through full charge and discharge cycles on the Reno Ace2 board. The BMS accepted handshake on first power-on and charge current stepped through the expected CC-CV profile without fault flags.
- Fuel gauge recalibration after install: On first use after installation, disable fast charging for one complete discharge-charge cycle. This lets the fuel gauge IC recalibrate against the new cell's discharge curve before VOOC push current into an uncalibrated coulomb counter.
Sudden shutdown at 20–30% on the Reno Ace2 after a cell swap
A new Li-Polymer cell has a slightly different voltage-discharge curve than the worn cell the phone's fuel gauge was trained on. When the Reno Ace2 hits a modem transmit burst or screen brightness spike, the new cell's voltage drops sharply at that uncalibrated threshold. The phone reads that sag as a critical low-voltage event and cuts power. One full, uninterrupted discharge down to automatic shutdown followed by a full charge to 100% resets the coulomb counter and eliminates the premature cutoff.
VOOC fast charging not activating on first cycle after replacement
Oppo's VOOC protocol requires a handshake between the charger IC and the battery's BMS before it allows elevated current. On a fresh cell, the BMS may not complete that handshake on the first plug-in, leaving the phone in standard 5V slow-charge mode. Disconnect the charger, power the phone off fully, then reconnect the original VOOC adapter. The handshake renegotiates on cold boot and fast charging resumes. If it still does not activate, verify the charger output is at least 5V/4A — third-party adapters that don't assert the VOOC data line correctly will keep the port in slow-charge indefinitely.