The U.S. aircraft register, updated daily
Parts

Engine Battery

No failure report names the engine battery. 2 FAA approvals let 1 company make a replacement engine battery, Mid-Continent Instrument CO holding the most (2).

Approved replacement parts 2 parts manufacturer approvals

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

For these models most: Robinson R44 (2).

MakerPartReplacesFitsGrantedStatus
Mid-Continent Instrument COEngine Battery Installation Kit, Type 1 9010144-6SLH-006Robinson R44, SN = 106052017-07-30current
Mid-Continent Instrument COEngine Battery Installation Kit, Type 2 9010144-7SLH-007Robinson R44, SN 10606+2017-07-30current

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.