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Loose (i.e., those not installed in equipment) lithium and lithium ion batteries may, in fact, no longer be put into checked luggage.
The "two-battery limit" applies only to lithium ion batteries with more than "8 grams of equivalent lithium content, (which) is approximately 100 watt-hours." The Reader's Digest version is that this limit roughly corresponds to the largest notebook batteries.
In other words, this limit shouldn't much affect most travelers because there's no limit on typical camera, cell phone, toy, and notebook batteries. So what is affected? Things like external notebook and professional videographer batteries. (I suspect that independent videographers will be one of the groups this new rule could inconvenience.)
One issue is that implementing the rule in the field is basically impossible, unless the screeners are just given some rule of thumb like "no limit on notebook batteries or anything smaller."
My notebook battery is marked only with a voltage and a milliAmp (current) rating. One can convert this to grams of equivalent lithium content (0.3 x voltage x Ah), but somehow, I don't see the screeners at security scrutinizing the label rating of batteries (when present) and whipping out calculators. So we'll have to see how notebook batteries in particular end up being counted, though I don't really expect issues around smaller camera and cell phone batteries.
There is no limit on battery below the 100 watt-hour limit in carry-on luggage.
The other relevant part of the rule is that loose batteries are now supposed to be placed in individual plastic bags or otherwise stored in a way that their contacts can't be shorted out. It's impossible to say to what degree this will be enforced, but it's probably something else to put on your travel prep list.
The Westborough, Mass.-based company has sought to make its batteries environmentally sustainable as well by not using PVC plastic or heavy metals--cadmium, arsenic, or mercury--in the manufacturing process.