HR20 XP-L is really good headlamp. I use this model since 5 years and is working without any problems. I need one more, someone can recommend something? :)
The alkaline batteries are nearly half the price of lithium, so if you're using them for low-drain devices they're your best bet. I can recommend Duracell Quantum AA Alkaline - CR tested a total of 13 alkaline batteries and this one is the best. Rayovac Fusion Advanced AA Alkaline or CVS Max AA...