HP 481089-001 - Real-time clock (RTC) battery - CR2032 button style, 3VDC, 220mAh, lithium, 20mm diameter, 3.2mm height Retail
HP 592965-001 - 3.0V battery - 250mAh, lithium coin cell battery - Type CR2330 or equivalent - Not rechargeable Sale $39.00 Retail $49.00
L17255-001 - CMOS Battery Real time clock (RTC) 3V 220mAh Type CR2032 Lithium Battery for EliteBook 840 G5 G6 850 G5 G6 G7 Sale $40.00 Retail $50.00