I've had the Quantum D2 for almost 5 years now and its not as reliable as it was when it was new. The battery doesn't last as long, the threads aren't as smooth, output isn't as stable, etc. So I'm hoping to find an alternative that I can use on my keychain. Some features I'm looking for: -Roughly as big as the Quantum D2 maybe slightly larger or slightly smaller, depending -Variable output or at least 3 modes with at least 120 lumens max. -Slots for tritium vials -Rechargeable or runs on rechargeable battery (nothing that runs on AAA or AA) -Currently in stock! It seems the D2 doesn't have many competitors for the features it offers, so any help would be greatly appreciated.