The HP 85Q98AA CS540 battery is a replacement battery for the Poly CS540 wireless headset. It is intended to restore battery operation when the headset’s existing battery needs replacing.
Its lithium-ion polymer construction has a capacity of 140 mAh. The listing specifies up to 7 hours of talk time and a 3-hour full charge, giving a clear reference for its stated use between charges.
This is a replacement battery for the CS540 headset, rather than a complete headset or charging base.
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