What battery options are available for the HP ProBook 4540s and what are their part numbers?
The HP ProBook 4540s is available with two battery options: a 9-cell, 93 WHr, 2.8 Ah Li-ion battery (part number 633809-001) and a 6-cell, 47 WHr, 2.2 Ah Li-ion battery (part number 633805-001). Both batteries are end-user replaceable components. (Page 42)
From the official HP Probook 4540s Notebook PC manual, page 42
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