Got 'em in yesterday. The charger that came with the unprotected ones is a very tight fit, but works. Hoog sez the Ad-108 charger will work, so I ordered one of those and a few more sets of batts. So far they work great with 510 and KR8 cartos (2.8 ohm) but of course a regular 510 atty trips 'em.
Great! I'll pick up a few as long as they go over 2 hrs. I wasn't planning on using 510s at 6v. The 801s I just got measure at 3.2 ohms which should be just about right (maybe a tad hot? we'll see).
I've been trying the 1.5 ohm LR 510 at 3.7v for the last 2 days. Got to say it's pretty awesome. Not sure if that might be the way to go. Don't know how long they last and they're $12 a pop so maybe not.