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Norelco T770 Beard Trimmer: Battery Pack Rebuild

The NiCd cells in my Norelco T770 beard trimmer finally gave out, for the obvious reason:

Norelco T770 cells
Norelco T770 cells

They’re rated at 600 mA·h, as are the much shorter 2/3  AA NiMH cells I also used for those phone packs:

Norelco T770 - rebuild
Norelco T770 – rebuild

That’s a wrap of Kapton tape around the cells, plus a block of closed-cell foam to fill the cell holder. It’s not a high-stress environment, so this hack-job repair should work fine.

The trimmer’s charge / discharge cycle remains hostile to NiMH cells and I don’t expect a great lifetime from the new cells, either…

Comments

One response to “Norelco T770 Beard Trimmer: Battery Pack Rebuild”

  1. Sonicare E5000 Toothbrush: Battery Decline « The Smell of Molten Projects in the Morning Avatar
    Sonicare E5000 Toothbrush: Battery Decline « The Smell of Molten Projects in the Morning

    […] In round numbers, I bought the thing in early 2010, so the cells lasted maybe 2-½ years. I routinely run the toothbrush until the blinky light indicates that it needs charging, then fill it up overnight, to avoid having the cells fail like the ones in the beard trimmer. […]