I would recommend the Duracell battery plus Mono D (LR20) 1.5V almost fully recommend the 4-pack: When unpacking is duly voltage. After uncomplicated insertion in the torch light goes on almost immediately. A star deduction I have to give that occasionally tends to polarize (not true, Horst?). Since I own the 1.5V Duracell battery plus Mono D (LR20) in 4-pack, I have finally overcome my energy poverty. Insbesonder I have determined that this product will last up to 50% longer than the Duracell Plus Power D DUR019171 Batteries (2-pack)!