Those are yokomo GP3300 shrink wraps.. and obviously, reedy purchase the batteries from them. It's been in the market with the exact yokomo/gp3300 shrink wrap from the first time it cames out (reedy mathed). Every newer/later production batch always have imporvement on both votage and runtime... yes, without changing the shrink wrap nor giving it another/newer packaging like others do.
Reedy uses GP3300 cells. They have the blue yokomo shrink on them. They are the same cell as all the other ones(green/orange, rainbow, and now the black/white epic). There was a running change to make them fit the roar guildlines for length.
The cells do vary with different batches just like all the other cells have in the past!!!