Battery Testing Facility

Standby and Emergency Power Supply Testing and Repair

Need testing, repairs, and general maintenance for your batteries and backup power supplies?

Full Service Battery Shop and Maintenance Services

Get professional battery maintenance, testing, and repairs from a team experienced in most aircraft power supplies.

E.T. Mechanical has a full service battery shop. We can service and test nearly any type of aircraft related battery. We frequently charge and test small aircraft main batteries and large jet main batteries.

Additionally, we perform capacitance tests on numerous different standby and emergency power supplies and batteries. We also have our own Repair Specifications on the widely used PS-823, PS-834, PS-835, PS-850 and PS-855 emergency power supplies from L3-Communications.

Do you have a newer or updated aircraft that is equipped with the Garmin G1000 series avionics package? We do capacitance tests on their standby batteries as well.

Is your aircraft equipped with the Mid-Continent standby ADI electric gyro? We can perform a capacitance test on its battery too!

If you have a battery, we can probably test it! Give us a call to discuss your electrical power needs.

If you are interested in performing your own battery maintenance, check out our capacitance test boxes from our sister company ShockBox Test Boxes at

ET Mech - Battery Shop

Capacitance Tests and Repair

Specialty Battery Tests

Expert General and Corporate Aviation Maintenance

Get help from experienced aircraft mechanics.


We are Oklahoma City's longest established general and corporate aviation maintenance facility. We get the job done.

Chet Collier Turbo Normalized Bonanza

No one touches my airplane except Ed Schwartz & E.T. Mechanical. Why? Because as an instrument pilot, Ed understands how important it is to have complete confidence in your “Bird’ before you launch. They do the job right.

Jim Clark Jim Clark & Assoc Inc

We’ve been using E.T. Mechanical for about 30 years. Being in the aircraft sales and management business, specializing in Citations and King Airs, I’ve used many maintenance facilities. Without question, E.T. Mechanical is simply the best by far.

Kris Takle Takle Aircraft Management

Out of all of the shops I have Used over my 25+ years of corporate aviation, nothing compares with the level of service and quality of the workmanship than E.T. Mechanical. Their attention to detail and quality control is the best in the industry.