Mildly Infuriating

I used to. I had a Black Diamond ReVolt that mysteriously took a shit one day after almost precisely 1 year of ownership. I replaced it with another one, the new "updated" model, and it did the same thing. So I gave up, and now I have a Shenzen Express no-brand 18650 headlamp that's been serving me well for about three years. It also cost like a quarter as much. I give up on Black Diamond lights. (I also hope my Black Diamond ATC doesn't have a hidden built in expiration date, either...)

My 18650 light has just under 4 times the available battery capacity as my old ReVolt. I run a 3600 mAh cell in it, versus the 950 mAh or so AAA's I could put in the old Black Diamond. And if push comes to shove I can always just pop the cell out of it and swap in another while the first one is charging.

I will point out for any existing ReVolt owners, as well, that the batteries Black Diamond include with the thing are absolute trash. Mine came with 750 mAh cells in it which were far behind state of the art even back when I bought my first one. If you want to put higher capacity cells in it, note that Black Diamond saved a nickel by not including any chemistry sensing hardware in the headlamp; it "detects" their NiMH cells by way of a set of contacts in the battery compartment that touch an unwrapped section of their cells. If contact is made it assumes you have rechargeables in there and if it isn't it assumes you loaded disposable cells and won't charge them. If you want to use aftermarket batteries with it and allow them to charge in the headlamp, you'll have to either peel some of the wrapping off of your cells or apply some foil tape or something. (This is surely to prevent imbeciles from putting alkalines in there and plugging it in, causing them to go off bang.)