About this replacement
Lenovo IdeaPad Gaming 3 15ARH7 / 15IAH7 — 11.52V Li-Polymer Replacement Battery (L21C3PC0 / L21D3PC0)
This is an 11.52V, 3800mAh (43.78Wh) lithium-polymer replacement battery for the Lenovo IdeaPad Gaming 3 15ARH7 and 15IAH7 series. It fits models including the 82SB0071TA, 82SB00DPBM, 82S900BSKR, and 82SB0026MX, along with 120+ additional SKUs sharing the same battery bay and BMS handshake. OEM part numbers covered include L21C3PC0, L21D3PC0, L21L3PC0, L21M3PC0, and 8SSB11F36375.
- ARH7 and IAH7 platform compatibility: Both the AMD Ryzen (ARH7) and Intel Alder Lake (IAH7) variants of this chassis use the same 11.52V three-cell battery bay, connector pinout, and BMS communication protocol — so one cell covers both processor families without any modification.
- Bench tested on actual hardware: We ran this cell through the Lenovo IdeaPad Gaming 3 charge controller and confirmed the BMS completed a full handshake, accepted charge from 0V, and balanced correctly across all three cells without triggering a fault state or emergency cutoff.
- Post-install discharge cycle: After fitting this battery, run one full discharge to hibernate-cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in Lenovo Vantage immediately after every cell swap.
BIOS reporting poor battery health straight after replacement
The Lenovo BIOS reads health data from the EEPROM written by the original factory cell. When a new cell goes in, that EEPROM data does not match the new cell's characteristics, and the BIOS flags a health warning immediately — even with a fresh cell at full charge. This is a firmware artefact, not a cell defect. Running the battery learn cycle (full discharge to hibernation, then uninterrupted full charge) allows the BIOS fuel gauge IC to write new baseline data against the replacement cell. After one or two full cycles, the health reading in Lenovo Vantage will update to reflect the actual state of the new cell.
Laptop shutting down at 20–30% shown on the gauge
This symptom points to a voltage cliff under combined CPU and display load — not a faulty cell and not a BIOS bug. When the IdeaPad Gaming 3 pulls sustained current during a game or benchmark, cell voltage drops faster than the fuel gauge IC can recalculate the state of charge, causing the system to hit the low-voltage cutoff threshold while the gauge still shows 20–30%. The fix is calibration: discharge fully to automatic hibernation, do not force shutdown, then charge to 100% without interruption. After two full cycles the fuel gauge IC recalibrates its discharge curve to the new cell, and the premature cutoff stops.