EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 1620
Flight Deck / Cabin / Aircraft Event Passenger Electronic Device; Flight Deck / Cabin / Aircraft Event Smoke / Fire / Fumes / Odor
Flight Crew Took Evasive Action; Flight Crew FLC complied w / Automation / Advisory
Equipment / Tooling
FA reported that a first class passenger reported to them that his portable battery was heating up and smelled like burning plastic. FA put the battery in a container with water as per their procedure and notified us that they had done that and there was no irregularities at this time. We advised them to carry on with their procedures and monitor the battery. Advised dispatch of the situation as well.Looking into if this particular type of battery pack is good for flight.Make: UnidenModel: WM4807
While cruising at FL350; we got a call from a flight attendant.  Flight attendant informed us that a passenger handed a phone charging battery pack that smelled like 'burnt plastic.'  Flight attendant said that the pack was not hot to the touch when the passenger handed it to her; but it did have a smoky smell.  The FAs followed the FAM procedure for Lithium battery fires that say to submerge the device in water.  When we got the call they already completed this procedure and there was no further sign of smoke or fire.  Therefore; I decided that declaring an emergency would not be needed in this case.  Instead; we continued the flight with caution; monitoring the condition of the battery pack.We verified that the flight attendant's manual procedures where complied with; notified dispatch and asked the FAs to keep monitoring the condition of the battery pack.The passenger was charging his phone with the device while this happened.  It was not connected to the PC outlet.
EMB-175 flight crew reported a passenger's portable battery overheated so the Flight Attendant placed the battery in a water container as per company procedure.