External Laptop Battery Charger for HP Compaq NB 6530b, 6535b, 6730b 6 – direct-charging
Upgrading a HP 6730B Laptop - YouTube
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Synergy Digital Laptop Battery, Compatible with HP Compaq 6730b Laptop, (Li-ion, 10.8V, 6600mAh) Ultra High Capacity, Replacement for HP 484786-001, 491173-543, HSTNN-144C-A, HSTNN-144C-B Battery - Walmart.com