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Compatible with HP EliteBook 840 G1 G2 Laptop Battery HSTNN-IB4R 717376-001 CM03 | eBay
HSTNN-LB4R - 3-Cell CM03XL CM03 Replacement Battery Compatible with HP EliteBook 840 845 850 745 750 G1 G2 ZBook 14 G2 15 G2 15u - CPU Medics
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HP Elitebook 840 G1 Battery Replacement - iFixit Repair Guide