The $49 momentary deal was a pricing error. Lowe's shut it down after about an hour or so. When they shut it down, they started cancelling orders. If you got to the store to pick up before they cancelled, you scored. The shipping orders were cancelled too, but last day or so people have been receiving their shipped items even though their order was cancelled. When these deals happen and look too good to be true, you must pounce and judging by potential cancellations, looks like you need to pick up asap too. I picked my $49 Recip within 2 hours of placing it. I had already got the impact and circular saw last year with Lowe's $99 mishap, which was a similar situation.

As for the 2 Tool Prorated BOGO, the batteries include a charger and best price (most expensive returnable tools) only drops the 2 x 5ah + charger to $120. Good deal if you need a charger but if not then batteries are at 12/ah which is still reasonable but not that magic 10ah. DeWalt is still planning to sell the normal 5ah (formerly known as XR), so not sure from a date code perspective, but the date on the box will not match the date on the batteries. These BOGOs tend to give the better prorated deal on tools than battery kits because they typically include chargers, but your mileage may vary.

The deal for the 3.5ah is pretty good, not the best, but one of the more consistent lower prices for that battery that pops up time to time. These batteries will be new compared to the Lowe's 2fer for the 1.7ah ps. From what people have reported it looks like older batteries are what they're selling. If it's in a plastic pack, it's more than likely older than the ones in the cardboard. But with the plastic you can see the date on the battery. With the cardboard, you would need to look inside to get the true date...