85V Li-Polymer Replacement Battery (JX40)
4V Ni-MH CMOS Backup Battery (69XXSY3000)
so one part number covers the full group without modification
That combined inrush creates a brief voltage sag on the cell
current draw spikes and cell voltage drops below the BMS cutoff threshold — even though the reported percentage suggests charge remains
Toshiba Satellite C40 Replacement Battery 10.8V 4400mAh PA5108U Warranty:Warranty 2 Year 85V Li-Polymer Replacement Battery (JX40)Toshiba Satellite C40 Series 10. 8V Li ion Replacement Battery (PA5108U 1BRS) This is a 10. 8V, 4400mAh (47. 52Wh) Li ion battery for the Toshiba Satellite C40 series notebook. It fits the C40 AD05B1, C40 AT15B1, C40 AS20W1, C40 AT19W1, and over two dozen additional C40 variants. OEM cross references include PA5108U 1BRS, PA5109U 1BRS, PA5110U 1BRS, PABAS271, PABAS272, and PABAS273. C40 series compatibility: All covered models share the same 10. 8V