About this replacement
Toshiba Satellite A70 Series — 14.8V Li-ion Replacement Battery (PA3383)
This is a 14.8V, 4400mAh Li-ion replacement battery for the Toshiba Satellite A70 notebook. It fits the A70-S2362, A70-S249, A70-S2491, and over 60 additional A70 variants. OEM part numbers PA3383, PA3383U-1BAS, PA3383U-1BRS, PA3385U-1BAS, PA3385U-1BRS, and PA3388U-1BAS all cross to this cell.
- Satellite A70 series compatibility: All A70 variants share the same 14.8V four-cell battery bay, connector pinout, and BMS communication protocol. One replacement covers the full lineup without modification.
- Bench tested on actual hardware: We ran this cell through charge, idle draw, and load cycles on the A70 platform. The BMS handshake completed without error codes, and charge acceptance held steady from 0% to full capacity.
- Post-install calibration — A70 specific: After fitting this battery, run one full discharge to hibernate cutoff, then charge uninterrupted to 100%. The A70 BIOS uses this cycle to reset its battery learn routine and clear the inaccurate health warning that appears after every cell swap.
Why the Satellite A70 BIOS flags a new battery as poor health
The A70 BIOS reads battery health from EEPROM data embedded in the cell, not from live voltage measurements. When you swap in a new cell, the EEPROM registers differ from what the BIOS recorded for the old pack, so it throws a health warning immediately. This is not a fault with the replacement cell. Running one full calibration cycle — full discharge to hibernate, then a complete uninterrupted charge — rewrites the BIOS battery table and clears the flag.
Satellite A70 shutting down at 20–30% charge shown on screen
This happens when the fuel gauge IC has not yet calibrated against the new cell's actual voltage curve. The IC maps percentage to voltage using data from the previous pack, so it misreads the cutoff point and triggers shutdown early. The fix is two to three full discharge-and-charge cycles, which allow the gauge IC to re-map percentage against the new cell. After calibration, the shutdown threshold aligns with the true cell cutoff at approximately 12.0V under load.