On Friday, August 15, 2014 11:24:31 AM UTC-4, wrote:
I have a fairly expensive flash light. Unfortunately it now has three

corroded AA batteies, in the "power tube". That corrosion prevents

"easy" removal / replacement.



Might one have a suggestion as to how I might remove the corroded

batteries?

1) screw an eye bolt in the tail of the last battery. use cord as DIY slide hammer to pull the last battery out. Hope that the other two aren't as stuck

2) remove both head and tail from battery tube, if possible, and use a dowel to knock the batteries out of the tube

for cleanup I have found that after flushing with water, Deoxit will get most of the nastiness out. If you need mechanical cleaning some scotchbrite (rip off small squares and push through with dowel etc.) may help. I'd definitely spray down with deoxit after finishing. Maybe even Boeshield T-9 or similar if this is a "hard use" light but only on the battery tube not on electronics (if any - I'm assuming that this is a modern LED light or you wouldn't be going through the trouble.)

Grease the threads and O-rings with Super Lube, Sil-Glyde, something like that.

and ditch the alkalines! Energizer Lithiums for primaries, or LSD NiMH for rechargeables (Sanyo Eneloop, Duracell Ion Core (which are supposedly rebranded Eneloop XX for an excellent price, and readily available in stores now), Maha Imedion, Tenergy Centura, etc.) Otherwise this will just happen again...

If the cells are well and truly stuck, if you can determine or already know what brand they are (and it's a major brand), contact the cell manufacturer, they may buy you a new light.

nate