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USA
NATO
SINCGARS
Batteries
  
BA-5372
6V backup battery

BA-5372, also known under different names and with a different chemical composition, is a 6V non-chargeable military battery, used by a variety of (military) devices and ancilaries for opera­tion and/or backup purposes. It is typically used in encryption devices – particularly in voice and data encryptors and in fill devices – to retain encryption keys in static volatile memory (CMOS).

The dimensions and physical apperance of the batteries vary wildly between manfuacturers, but the outer dimensions are 31.5 × 16.8 mm in all cases. Another parameter that varies between manufacturers is the voltage. Although this is specified at 6V, some are 7.5V. Always check whether this is allowed for your equipment.

A major disadvantage of this battery is the fact that it is manufactured in the US and that due to its chemical composition — it contains lithium or mercury — it cannot be shipped via airmail. As a result, these batteries are hard to get in Europe.
  

Another disadvantage is the high price, which typically ranges between 40 and 70 US$ (2024). Note that — unlike with regular batteries — the tip is the (-) contact, and the flat-faced side is the (+) contact. If there are two flat sides (i.e. no tip), check the engravings on the flat surfaces.

BA-5372 batteries on this website
AN/KOI-18 Key Tape Reader
AN/KYK-13 Key Transfer Device
MX-18290 ECCM fill device
Digital Subscriber Voice Terminal
KY-57 (VINSON) Wide-band Voice and Data Encryption Unit
KY-99 (MINTERM) Narrow-band Voice and Data Terminal
KG-84 dedicated loop encryption device
RT-1439 SINCGARS (non-ICOM) radio set
Dimensions
The dimensions and physical apperance of the batteries vary wildly between manfuacturers, but the outer dimensions are 31.5 × 16.8 mm in all cases. This is done to ensure that the battery fits the battery compartment of the device in which it's installed. There are also some minimum con­tact diameters to ensure proper conductance. The diagram below shows the regular dimensions.

 BA-5372/U Datasheet

Versions
The 6V backup battery was available over the years in the following incarnations:

ID Power Chemistry NSN Manufacturer
BA-1372/U 6V Mercury 6135-00-801-3493 Discontinued
BA-5372/U 6V/0.5Ah LiMnO2 6135-01-214-6441 Bren-Tronics, Ultralife, Saft, Dantona
? 7.5V/0.2Ah Alkaline 6135-00-801-3493 Elfa
? 7.5V Alkaline ? AEA Technology, Varta
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Usage
The BA-5372 (or equivalent) is known to be used in the following equipment:

  • RT-1439
  • RT-1476/ARC
  • RT-1477/ARC
  • RT-1478/ARC
  • SYX-15
  • VSQ-1
Documentation
  1. BA-5372/U Technical Datasheet
    Ultralife Corporation. UBI-3021 Rev.: K. 12 january 2011.
Further information
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© Crypto Museum. Created: Friday 26 April 2024. Last changed: Monday, 29 April 2024 - 08:59 CET.
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