B777-200
Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument; Flight Crew Multiengine
Communication Breakdown
Deviation / Discrepancy - Procedural Hazardous Material Violation; Deviation / Discrepancy - Procedural Published Material / Policy
Aircraft Equipment Problem Dissipated; Flight Crew Overcame Equipment Problem
Human Factors
1 hour into flight we received an ACARS message from Dispatch Center.  They were advised from ZZZ Ramp; we had 10 lithium batteries in position 11L per the Dangerous Goods (DG) paperwork.  We actually had 19 lithium batteries in position 11L.  Weight and Balance was correct because they were weighed in the container; just incorrect amount on the manifest. [The cause of the issue was the lack of] attention to detail. [Suggest] double checking paperwork.
B777-200 Captain reported that while airborne; Dispatch notified them of an incorrect number of Lithium-Ion batteries listed on flight crew hazmat documents.