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Opening an HP A2941A 600 VA PowerTrust UPS

I finally took the time to replace the batteries in my PowerTrust that I use for a UPS on my HP918, and other things. Below are a few pictures that may help others, if they feel the need to do the same. I paid $25 US Dollars per battery at Batteries Plus, 23 March 2011.
  1. PowerTrust front view
  2. PowerTrust side view
  3. PowerTrust back view
  4. PowerTrust front panel rear
  5. PowerTrust front internal
  6. PowerTrust internal side view
  7. PowerTrust rear wiring tray
  8. PowerTrust power connectors
  9. PowerTrust exposed batteries
  10. PowerTrust Battery Block

PowerTrust Front

1 - PowerTrust front view

Note the 2 screws at the bottom. These attach the front panel; not the case.
PowerTrust side

2 - PowerTrust side view

Note the 2 screws at the bottom, and how the casing indents on the bottom. Its the same on the other side.
PowerTrust back

3 - PowerTrust back view

Note the 5 screws in the case.
  • Remove the 5 rear screws, the 4 side screws, and the 2 front screws.
  • Pull bottom indented case sides appart and work the case back half an inch, and finally remove it.
    • PowerTrust back of front panel

    4 - PowerTrust front panel rear

    Note the 3 screws holding the front panel.
    Note the data ribbon and its orientation (ribbon side of plug is near the case side).
  • Remove the 3 front panel screws and unplug the data ribbon. Push the ribbon through the ribbon hole and set the front panel down.
    • PowerTrust Front panel removed

    5 - PowerTrust front internal

    Note the 2 wiring tray mounting screws.
    PowerTrust side internal

    6 - PowerTrust internal side view

    Note the rear wiring tray mounting screws.
    Note the battery connectors and how they connect between batteries (connected in series).
    PowerTrust rear screws

    7 - PowerTrust rear wiring tray

    Again note the rear wiring tray mounting screws.
    PowerTrust wiring

    8 - PowerTrust power connectors

    Note the 5 power connectors.
    The labels on the breadboard say Yel, Red, Blk, Blu. The Yellow, Black, and Blue tabs appear twice on the breadboard.
    When I put it back together, I didn't notice all this before. I placed my Black connector on the other black tab, near the red one. But it seems to work fine (yes, I tried the test button when my system was back up).
  • Unplug the 5 power connectors and push the wires through the hole in the wiring tray.
  • Unplug the 2 power connectors that go to the battery block.
  • Remove the 2 front wiring tray mounting screws.
  • Remove the 2 rear wiring tray mounting screws.
    • PowerTrust battery bay

    9 - PowerTrust exposed batteries

    Note the wiring tray bottom tabs that surround the battery block.
  • Work the wiring tray up and off of the battery block and lay it on the side. It may be somewhat tight because of the transformer wires that we avoided to detach.
    • PowerTrust battery type

    10 - PowerTrust Battery Block

  • Remove the battery block.
    • The batteries are held together by what appears to be 2-sided sticky tape. I used velcro sticky-back squares for my new batteries. Note the type of battery: 6V 10ah. Batteries Plus had the similar battery, 6V 12ah. DURA6-12F2 DURACELL ULTRA 6V 12Ah AGM
    Duracell 6V 12Ah AGM
  • 17-Nov-2016 Replaced both PowerTrusts; did not use sticky tape this time. DURA6-12F2 DURACELL ULTRA 6V 12Ah AGM

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