Energup P108 4000mAh Ryobi 18V Lithium Battery Pack $27 at Amazon
Amazon with Energup has the Energup P108 4000mAh Ryobi 18V Lithium Battery Pack for $34 - 20% off coupon (clip green coupon) =
$27*with free shipping. Compatible with Ryobi 18-Volt ONE+ P104 P105 P102 P103 P107 tools.
Original Source of Info