I must be a doofuss, i go to take my 901 battery off the charger, the light cap pops off, and then things got real interesting. the whole outer sleeve slides out into my hands , and i'm looking at the gut's of the battery. i try putting the sleeve back on and get my battery out of the charger. nope just twisted the wire till it broke, well i had plans of takeing a battery & an atomizer apart but after they were dead, lol. took me 20 minutes and a bunch of cussing to get the final piece unscrewed from inside the charger, you can bet i will be much more carefull screwing and un-screwing them into the charger from now on.