(WO9313568-A1)      A battery heating system with a thermometer probe and at least one heating element. The heating element and the probe are arranged pref. liquid tight and acid proof inside the battery. The heating element (10) is at least one power transistor supplied with current by the battery and fixed on a cold body (18) e.g. a metal plate. The control electrode of the transistor (10) is controlled by a temp. regulating circuit, if the battery temp. lies below a specified temp. desired value, and the battery voltage is larger than a lower threshold value and smaller than an upper threshold value of the voltage.    A trigger circuit is provided, which responds to the rise of the battery voltage, following the switching off of the current in a user with a high current consumption. The trigger circuit then operates a time circuit (100), which with the battery voltage lying under the lower threshold value or the same as this, controls the power transistor (10) is a conducting mode for a set period of time.    ADVANTAGE -   Battery has good starting characteristics also, if battery without charging was subjected to low external temp. for relatively long time.    (JP7502373-W)      A battery heating system with a thermometer probe and at least one heating element. The heating element and the probe are arranged pref. liquid tight and acid proof inside the battery. The heating element (10) is at least one power transistor supplied with current by the battery and fixed on a cold body (18) e.g. a metal plate. The control electrode of the transistor (10) is controlled by a temp. regulating circuit, if the battery temp. lies below a specified temp. desired value, and the battery voltage is larger than a lower threshold value and smaller than an upper threshold value of the voltage.    A trigger circuit is provided, which responds to the rise of the battery voltage, following the switching off of the current in a user with a high current consumption. The trigger circuit then operates a time circuit (100), which with the battery voltage lying under the lower threshold value or the same as this, controls the power transistor (10) is a conducting mode for a set period of time.    ADVANTAGE -   Battery has good starting characteristics also, if battery without charging was subjected to low external temp. for relatively long time.    .D