NOVELTY - Apparatus comprises: many cells; charger connected to cells such that charger directs discharge load current on path separate from path of charging current; battery condition indicator and controller connected to first order battery protection circuit; first order battery protection circuit connected to at least one sensor; at least one sensor connected to at least one cell and operative to sense predetermined condition of at least one cell; and first order battery protection circuit configured to disconnect at least one cell under predetermined condition sensed by at least one sensor.    USE - The apparatus is useful: for indicating a condition of a cell of a battery (claimed); for powering fluid warmer (105) used for intravenous or similar fluids where the intravenous fluid warmer is used in military and civilian emergency settings (including battlefield or civilian medical facility); and for powering other medical or electrical devices and equipments.    ADVANTAGE - The apparatus: provides improved electromagnetic compatibility performance; has intelligent power control within safe operating limits of the lithium polymer cells, due to built-in safeguards against dangerous lithium polymer battery conditions; and is portable unitary device, having small size, thus enabling reliability and safety in operation without a need for auxiliary or additional equipments.    DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included for a battery pack comprising: many lithium polymer cells (152); a charger connected to the lithium polymer cells; a spread spectrum oscillator connected to the charger; a battery condition indicator and controller connected to the charger; a first order battery protection circuit connected to elements comprising the battery condition indicator and controller, at least one sensor connected to at least one lithium polymer cell, a cell balance circuit connected to the at least one lithium polymer cell and a battery disconnect switch; and a second order battery protection circuit connected to the at least one lithium polymer cell and a thermal fuse.    DESCRIPTION OF DRAWING(S) - The figure shows a fluid warmer assembly.    Fluid warmer cover (101)    Fluid warmer (105)    Cartridge (105a)    Fluid warmer heating and control unit (107)    lithium polymer cells (152)