About this replacement
Acer Aspire 5 A515-43 Series — 15.4V Li-Polymer Replacement Battery (AP19B5L)
This is a 15.4V, 3500mAh (53.9Wh) lithium-polymer replacement battery for the Acer Aspire 5 A515-43 series notebooks. It fits the A515-43-R1JF, A515-43-R41R, A515-43-R61P, A515-43-R8JP, and over 145 additional Aspire 5 variants sharing the same connector and BMS handshake. OEM part numbers AP19B5L and KT00405010 both apply.
- A515-43 platform fitment: All A515-43 variants in this generation share the same 15.4V four-cell Li-Polymer architecture, connector pinout, and BMS communication protocol — which is why one part number covers the full production run across CPU and GPU SKUs.
- Bench tested on actual hardware: We cycled this cell on an A515-43 unit and monitored BMS handshake acknowledgement, charge termination at full capacity, and thermal behaviour under sustained CPU load. The BMS accepted the cell without error flags and terminated charge correctly at 15.4V.
- Post-install recalibration on the Aspire 5: After fitting this cell, run one full discharge down to hibernate cutoff, then charge uninterrupted to 100%. This resets the BIOS battery learn cycle and clears the inaccurate health warning that appears in Acer Care Center after any cell swap.
Why the Aspire 5 reports poor battery health immediately after replacement
The A515-43's BIOS reads stored EEPROM data from the old cell and compares it against the new cell's reported state-of-charge on first boot. Because the EEPROM history doesn't match the fresh cell, the system logs a health warning before any calibration has occurred. This is a firmware artefact — not a fault with the replacement cell. Running one full discharge-to-hibernate cycle followed by a full uninterrupted charge gives the fuel gauge IC a complete data set to work from. After two to three cycles the BIOS health status will update and the warning clears.
Aspire 5 shutting down at 20–30% charge shown on screen
This happens when the cell voltage drops below the BMS cutoff threshold under combined CPU and display load, even though the OS fuel gauge still shows charge remaining. The fuel gauge IC has not yet mapped the new cell's voltage-to-capacity curve, so it misreports remaining capacity. The cell hits its minimum voltage cliff before the OS predicts it should. Run two full discharge-to-hibernate cycles, charging fully between each, and the fuel gauge IC will recalibrate its curve to match the actual cell chemistry — shutdowns at false percentages will stop.