Need to change the batteries in a Stanley bar flex light. lost instructions. how do you change the batteries.

I know this thread is old, but I just had to change the battery pack in mine. I could not locate a 4 pin battery pack so here's what I did:

You'll need: 3 NiMH 1.2v AA solder tab batteries, Razor blade, #1 Phillips driver, Kapton tap (standard electrical tape will do), soldering gun/iron, spare 18awg wire
1. Use a razor blade to remove the black sticker from the bottom of the flashlight base, it covers the magnets
2. remove the three outer phillips screws (the inner ones hold the magnets in and can stay installed)
3. Pull off the bottom plate
4. Pull out the battery pack and disconnect it from the flashlight at the 4-pin queeze connector
5. Remove the outer wrap and end protectors from the old pack keeping the end protectors in tact
6. Assemble the 3 new batteries in the same configuration as the old pack using Kapton tape, connecting + to - at the same two spots (use the old pack as a reference)
7. Carefully desolder the 2 wire leads from the old battery pack
8. connect up the 2 power wires to the same two spots as the old pack and insert the temperature probe between two of the batteries as in the old pack
9. Put the end caps on the new pack and wrap the entire thing in Kapton tape to simulate the plastic wrapper you removed
10. Install pack in to base, secure bottom plate and re-adhere black sticker(if needed you can use non-foam double-sided tape or spray adhesive)

The old pack was rated at 1300mAh and I used three 2000mAh each for a total of 6000mAh so theoretically the light should run for about 6 times as long between charges.

Sorry, the batteries on this light are permanently installed and are not replaceable.
You charge it like a cell phone with a wall charger.
When it no longer takes a charge, throw it away. Not a real great product.

Regards,

The Electron Guru