PORTER-CABLE 20V MAX Lithium Battery, 4-Amp Hour Battery (PCC685L) $23.89

Ships and sold by Amazon. $0.01 more than lowest price ever according to camel camel camel.
Available for less from a 3rd party seller, but I suggest purchasing directly from Amazon to be sure the battery is authentic.
https://www.amazon.com/PORTER-CAB…g=UTF8&me=