The invention is directed to a discharge indicating means for a storage battery (B) in which a choke (L) and a first transistor (T1) are connected to the storage battery via a switching device (S). The base of a second transistor (T2) arranged between the base of the first transistor (T1) and reference...http://www.google.fr/patents/US4758772?utm_source=gb-gplus-shareBrevet US4758772 - Discharge indicating means for a storage battery
