A cell phone carries a single lithium power cell, as opposed to early phones which carried a battery of cells.
Battery is actually the plural, though it is commonly used now as the singular as well for a power cell.
 LenHazell53
                                                
                                                Level 9
                                                Dec 7, 2020
                                            
                                                
                                                    LenHazell53
                                                
                                                Level 9
                                                Dec 7, 2020                                            
                                        Battery used in oil field as well. At least when I work for a guy he said we were painting batteries. It was the large crude oil tanks.