An official website of the United States government
Here's how you know
A .mil website belongs to an official U.S. Department of Defense organization in the United States.
A lock (lock ) or https:// means you’ve safely connected to the .mil website. Share sensitive information only on official, secure websites.

Home : Articles
Would you stake your life, right now, on the condition of your equipment?
NEWS | March 27, 2024

ECU: Preventing Battery Discharge

BLUF: ECU batteries need a full charge to retain their full capacity.

GUNG Engineers Install Environmental Control Units
Photo by JoAnna Delfin
Environmental control units (ECUs) require fully charged onboard batteries to remain cool and preserve temperature-sensitive material during transportation to laboratories for analysis. The ECU can operate on partially charged or discharged batteries when connected to an AC power source; however, if the AC power is disconnected then the ECU shuts down and the onboard batteries discharge.

The 12-volt DC batteries inside of ECUs require constant recharging to retain their full charge capacities. Batteries that sit inside of ECUs without recharging can begin to lose capacity to hold a full charge in as little as a few hours.

Remove, check and recharge batteries weekly in accordance with WP 0050.7 of TM 3-6665-428-10 (Sep 14). Charge the batteries by connecting the battery harness connector to the fusible link connector and connect the AC power cord to the ECU power panel 100-240VAC 50/60Hz 120W INPUT connector.
Connect battery harness to fusible link connector
Connect battery harness to fusible link connector

Connect AC power cord to ECU power panel
Connect AC power cord to ECU power panel
Use an AC power source from the DR SKO system generator set, shore power, or an additional power cord in accordance with WP 0050.2 of TM 3-6665-428-10 (Sep 14). The additional power cord allows operators to remove the ECU from the DR SKO system and operate and charge the ECU from alternate AC power sources. Need to order an additional power cord? TACOM recommends using NSN 6150-01-512-1007. 
Additional power cord assists operators
Additional power cord assists operators

While operating the ECU, make sure that the battery harness connector is connected to the fusible link connector in accordance with WP 0050.2 of TM 3-6665-428-10 (Sep 14).  When performing AFTER OPERATION procedures and preparing to stow the ECU, make sure the battery harness is disconnected. If it’s not disconnected, the ECU will continue to operate after AC power is disconnected and discharge the batteries. 
Want to get better search results faster? 
Click the link below to access our "how to" guide
After entering a keyword, you must hit or click the Search bar/box below for the function to work.
Simply hitting Return won't yield results.
Note about links to archive articles

If you come across a link to a pre-2014 PS Magazine issue or article that uses LOGSA in the web address (URL), use this link instead:
For issues/articles from 2014 and after, click on the Archive/Index tab in the top menu of this website.

BE ADVISED: With the migration to Army365, emails in older articles may still reflect an address. To update, change the domain to