About this replacement
Lenovo IdeaPad Duet 3 10IGL5 — 7.68V Li-Polymer Replacement Battery (L19C2PD7)
This 7.68V, 3850mAh (29.57Wh) lithium-polymer battery replaces the original L19C2PD7 cell in the Lenovo IdeaPad 3 10IGL5 and IdeaPad Duet 3 10IGL5 series. It fits the 10-inch detachable notebook platform, restoring power to the keyboard-base battery unit. Voltage and connector match the OEM specification across all 82AT and 82HK variants.
- IdeaPad Duet 3 10IGL5 platform fit: The 82AT and 82HK sub-variants share the same battery bay geometry, connector pinout, and BMS handshake protocol — which is why a single cell covers the full Duet 3 10IGL5 range. The 7.68V nominal rail matches the Celeron N4020 platform's power delivery spec exactly.
- Bench tested on actual hardware: We ran this cell through charge and discharge cycles on an 82AT unit. The BMS accepted the cell without fault codes, the protection circuit engaged correctly at low-voltage cutoff, and charge current tapered as expected near full capacity.
- Post-install discharge cycle: After fitting this battery, run the laptop down to hibernate-cutoff under normal use, then charge uninterrupted to 100%. This forces the BIOS battery learn cycle to reset against the new cell's actual capacity — skipping it leaves the fuel gauge reading inaccurate health data from the previous cell's EEPROM.
BIOS reporting poor battery health immediately after swap
The IdeaPad Duet 3 BIOS reads health data cached in the old cell's EEPROM. When a new cell goes in, the BIOS compares its current readings against stale reference data and flags the battery as degraded — even when the cell is brand new. This is not a fault with the replacement battery. Running one full discharge-to-hibernate followed by a full uninterrupted charge resets the learn cycle and clears the false warning. After two or three full cycles, the health indicator will align to the new cell's actual capacity.
Laptop shuts down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's discharge curve. The gauge loses accuracy at the low end and triggers a shutdown before the battery is actually empty — or the displayed percentage does not match the real state of charge. It is not a cell defect. Run two to three full discharge cycles from 100% down to automatic hibernate, then charge fully each time. After calibration, shutdown should occur at or below 5% with the low-battery threshold set to its default value in power settings.