I just emailed terralux and they are coming out with a replacement called the 310m-ex. Here was the reply:
"Estimate shipping to our retailers is currently late November, so it should be available in about a month. It's a pretty cool module- you can select either multi-mode functionality or single mode functionality via a dip switch on the side of the unit.
If your MagCharger® has the new multi-function switch, put the 310 in single mode, and let the Mag switch take care of all your mode needs. Or, if your Mag has an older standard on/off switch, you can opt for either single mode or a multi-mode (hi/med/lo) function by moving the dip switch on the module. Quite literally the best of both worlds. Output goes to >1,000 lumens as well. I think the light pattern is improved over the 300 module, too. Smoother."
Here is the website:
http://www.terraluxportable.com/product/tle-310-m-ex/