The U.S. aircraft register, updated daily
Parts

Battery Discharge

No failure report names the battery discharge. 2 FAA approvals let 2 companies make a replacement battery discharge, United Beechcraft INC holding the most (1).

Approved replacement parts 2 parts manufacturer approvals

A parts manufacturer approval (PMA) lets a company other than the aircraft's maker make a battery discharge and sell it as an approved part for the models named. These are the companies holding such approvals for a battery discharge:

For these models most: Cessna 550 Citation II (1), Cessna 500 Citation I (1).

MakerPartReplacesFitsGrantedStatus
Guernsey Company theBattery Discharge Monitor TABD100K Rev. (-)modification partCessna 5502003-07-08current
United Beechcraft INCBattery Discharge Monitor TABD005Modification PartCessna 500 S/N 0214 thru 03491992-09-03current

Sources: the FAA's service difficulty reports since 1995 (a report is a part that failed and was fixed, as filed by an airline, repair station or owner; the count shows reporting as much as reliability) and the parts manufacturer approvals in the FAA's Dynamic Regulatory System. The part name is the reporters' and the approval holders' own words, reduced to the first plain words so that spellings meet.