Hi Michal, there was an urgent field safety notice issued by Medtronic in Dec. 2017 regarding corrupt firmware of their own OEM batteries, I would assume it may be very difficult to purchase compatible Li-ion with the correct firmware installed (I may be wrong.
I understand Covidien make you pay through the nose for these items, but I dont think I'd risk it.
Long gone are the days of the PB840 with with their lead acid batteries.
Malcolm.