Bought as spare batteries for the navigator. These should be more resistant to cold than battery and NiMH batteries. Not yet in use of NAV, but other devices are based on better and longer lasting. The only downside is the price, which is three times that of a NiMH battery.
In the TM test (Sheet 1/11), Energizer Lithium gave 2.5 times longer light than an alkaline battery. The graph is compared to the Energizer alkali, but in the specifications of Ducacell Plus, but the same result is the same.