Craftsman 40V 4Ah Packs $66

Apparently they're phasing these out - I snagged 4 on-the-shelf at my local Sears. IIRC, they have Sanyo cells - same as the 40v Ryobi. 10s2p (36V).

http://www.craftsman.com/craftsman-40v-rechargeable-lithium-ion-battery-98742/p-07198742000P

They look a similar size to the greenworks 40v batteries. :?

Difficult to see, but appears to be Sanyo UR18650RX