The original notebook battery 4 Cell, Long life, Li-Ion, 3550 mAh, 52 Wh, 687945-001 from Hewlett-Packard guarantees very good quality at an amazing price.
Fits, among others: for laptop models:,
HP/Compaq
– Laptops and Hybrids EliteBook 2570p Notebook PC
– Laptops and Hybrids EliteBook 840 G1 Notebook PC
– Laptops and Hybrids EliteBook 8570p Notebook PC
– Laptops and Hybrids EliteBook Folio 9470m Notebook PC
– Laptops and Hybrids EliteBook Folio 9470m Ultrabook
– Laptops and Hybrids EliteBook Folio 9480m Notebook PC
– Laptops and Hybrids ProBook 650 G1 Notebook PC