In reference to the boxes that are usually known as IC battery units, there's a few. Most will be lithium post 80s or mercury prior to the mid 80s. Some from the late 80s to mid 90s will be silver. But you never ever want to attempt to open one up. Batteries may be a cell, a canister, or a soft shell. Lithium goes boom. Mercury is toxic. And while a silver cell is worth 50c a canister would be worth less than 10 and the mix of chemicals is toxic. Playing around in stuff like that is just a bad idea.
But back to the question. On these box types they are "not user replaceable" so they fall outside of labelling laws prior to the late 2000s (08 I believe) as far as requiring markings. Best bet it to look up the numbers on the box, or ask one of us when in doubt. And there's literally many dozens of variants in coding. I'll be back with more later. ;)
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