Seeing as this is the current battery thread
I did a bit of looking at the Panasonic and Kodak sites as these brands are readily obtainable at the likes of Poundland and Homebargains... and I had got curious over anecdotal and objective evidence regarding alkaline vs zinc/zinc chloride etc. The Panasonic batteries apparently are Zinc Carbon and not chloride:
https://www.panasonic-batteries.com/...zinc-batteries
https://www.panasonic-batteries.com/en/zinc/zinc-carbon
whilst Kodak's are zinc chloride. The Kodak batteries have detailed data sheets available and show a 1050mAh vs 2700mAh for zinc vs alkaline, albeit with a significant internal impedance difference of 2 ohm vs 0.15 ohm. Both discharged to 0.8 volt into 75 ohm.
I'd also never heard of Kodak premium alkaline's (never see those in Poundland) and these have 3000 mAh capacity at 0.1 ohm impedance.
The overall consensus from the manufacturers is that the Zinc's are the preferred choice for clocks and remotes etc. I'm currently using Kodak zinc chlorides in my HP mouse and I'll be interested to see how they compare to the alkalines which typically last 5 to 6 months.