Select products now available online for purchase  

BT-70757BK, BB-2557/U zoom

  • BT-70757BK, BB-2557/U

2.5Ah, Standard BB-2557/U Rechargeable Lithium-Ion Battery (BB-2557/U)


This latest configuration of the BB-2557/U is built tougher and runs 14% longer than the BT-70757 version. It is certified by the DOD for Military Use. Typically used in many different devices such as unmanned robots (UGV and UAV's), TACFIRE, and REMBASS

  • Military#: BB-2557/U
  • NSN: Conforms to: 6140-01-490-5387
  • Chemistry#: Li-ion
Need a larger quantity or purchasing outside of the US?
Request a Quote
  • ● Complies with SMBus v1.1 and SBData v1.1

    ● UN/DOT 38.3 Rating: 75Wh

    ● Comparable to: BT-70757, BT-70757A, BT-70757BE, BT-70757BG, BT-70757G, BB-2557/U, and BB-557/U

    ● Absolute state of charge indicators

    Typically used in:

    ● TACFIRE (AN/PSG-2A & 2B)

    ● REMBASS (RT-1175A/GSQ)

    ● AN/PSQ-7

    ● Unmanned Robots (UGV/UAV)

Size / Weight

  • Length

    4.125 +/- 0.031 in (105 +/- 0.78 mm)

  • Width

    1.437 +/- 0.031 in (37 +/- 0.78 mm)

  • Height

    3.916 +/- 0.031 in (99 +/- 0.78 mm)

  • Weight

    1.2 lb (0.54 kg)


  • SMBus


  • State of Charge Indicator


  • Connector

    6 Pin Floating Type per U.S. Army DWG #SC-C-179495

  • Voltage

    28.8V, Two (2) Sections each 14.4V

  • Maximum Voltage

    33.6V, Two (2) Sections each 16.8V

  • Capacity

    In 24V Mode: 2.5 Ah, In 12V Mode: 5.0 Ah

  • Storage Temperature

    -40°C to +40°C (-40°F to +104°F)

  • Operating Temperature

    -20°C to +60°C (-4°F to +140°F)

Customer who bought this item also bought

  • Discontinued

    BB-2590/390/2557 Medium Rate Charger w/ Cigarette Lighter Adapter

  • BTA-70812

    Adapter for charging one (1) or two (2) BB-2557/U or BB-557/U batteries.

  • BT-70791CK

    The BB-2590/U is built tougher and has significant improvements than its 2004 version. It is certified by the DOD for Military Use. Typically used in over 71 different devices such as Communications gear (SINCGARS, AN/PRC-117, etc.), Robots, and Jammers. BB-2590/U 7.5 Ah Rechargeable Lithium-Ion Battery

  • BB- 2590/390 Low Rate Charger

    Small light weight low cost dedicated charger will charge BB-2590/U and BB-390B/U. Typically takes about 12 hours to fully charge your batteries. It will charge the BB-2590/U to 33.6V thus achieving 7% more capacity. Full Charge Low Rate Charger

  • BB-2590/390/2557 Full Charger Medium Rate Charger

    This single-station charger that will charge the BB-390B/U, BB-2557/U and the BB-2590/U batteries. Charger provides longer equipment runtimes by providing an additional 7% capacity into the BB-2590/U. Charge times for a depleted BB-2590/U are 7.5 hours. BB-2590/390/2557 Medium Rate Charger

  • BB-2590/U, 9.9 Ah High Capacity Rechargeable Lithium-Ion Battery

    High capacity BB-2590 fielded worldwide. 9.9 Ah High Performance BB-2590/U Lithium-Ion Battery

  • X90 AC Inverter and USB Charger

    Charge up your USB powered devices using standard military batteries: BA-5590/U, BA-5390/U, BB-2590/U, and BB-390/Us. Charges your phone, PDAs, Cameras, Tablets, portable media players and more in same time it normally takes with any other USB option.

  • BA-5590/5390 & BB-2590/U USB Charger: 3.1 Amp Output: NEW AND IMPROVED!

    Charge USB powered devices using standard military batteries: BA-5590/U, BA-5390/U, BB-2590/U, and BB-390/Us. The dual power charger works with most devices as your phone, PDAs, cameras, Tablets, portable media players and much more. BA-5590/5390 & BB-2590/U USB Charger

  • Medium Rate AC/DC Charger Kit with US Plug Adapter

    NEW kit leverages trailer hitch connection to provide charging solutions via AC/DC and solar panel. Includes: single-station charger for 2590/390/2557 batteries, AC/DC US plug power adapter, cigarette lighter adapter & carrying bag.

Related Products


  Featured Videos

No Videos yet...

No Videos yet...

Ask a Power Expert

Our Power Experts Are Here to Help

Still have questions? Contact one of our engineers or sales managers for help.

Ask a Question


Be Proud - Buy American!

"Buy American" Directly from Bren-tronics' factory in Commack, NY.