[thianwong1]

Here is a blurb on them from a seller. http://www.microbattery.com/products/seizaiken-watch-battery

I have not seen them here in my area malls. Mostly Panasonic watch batteries are sold. I recall seeing some Sony batteries on the shelf in a large electronics store but their price was the highest. For low end AA, AAA etc batteries, many are Chinese made. I always buy the Panasonic ones at my local mall stores. Average cost is $5.
I am sure the Sony batteries are excellent but you pay for it! Sony company just went through a financial shakeup, being the last holdout to revamp its company to save huge losses in revenue. Panasonic and Sharp already bit the bullet and cut areas and staff to stem the huge losses.

 

[thianwong1]

So why does a silver oxide battery package have the symbols for mercury (Hg) and lead (Pb) on it?

Tony, here is a wikipedia page ...scroll down to the list of cell compositions and you will see that silver oxide batteries have a minute bit of mercury but no lead listed.

To be politically eco friendly, the tag says NOT to discard them in the trash can.
http://en.wikipedia.org/wiki/Battery_recycling