Where can I find a replacement charging base for my Oster Cordless Trimmers?

SOURCE: Panasonic KX-TGA101S base not charging.

Here are a couple things you can try.

Clean the charging contacts, this can be done two ways. The manufacture's recommend using a pencil eraser. I recomend using a q-tip and some rubbing alchol. Just rub the alchol soaked q-tip on all the metal contacts on the bases and the bottom of the handset.

Gooo luck.
Hope this helps

SOURCE: GE Model 27911 DECT 6.0 Additional Cordless Handset not working

I had the same problem. What worked for me, after several unsuccessful registration attempts, was to disconnect the phone handset battery for about 1 min and then reconnect the battery. Run the handset registration procedure again. It registered for me on the first attempt after the battery reinstall. Good luck.

SOURCE: Clippers jam and won't cut when trying to use attachments

OIL THE CLIPPERS AND CLEAN THE HAIR OUT REALLY GOOD.

SOURCE: Hoover Freejet Cyclonic will not charge after battery run flat

basically, the batterie pack is shot and it will cost about £40.00 ish to replace. as you said, a right rip off

SOURCE: Proffesional Oster clippers model 274-69 seems to be frozen...

First, these are very sensitive to no lubrication. They should be lubricated every use to every few uses. Put a drop or two of light machine oil (sewing machine oil is about right) directly on the cutting blades. That may fix your problem. Also, watch the blades once you getit running and make sure the teeth totally pass each other or it will pull hair -- no fun! The travel of the moving blade is generally adjustable via a large plastic screw on the side of the clipper.