Always down for a good m12 deal but I really have to question why the 3.O exists. It's as large as the 4.0, 6.0, 5.0 HO etc, but less capacity.
Meanwhile, the CP3.0 is much more compact with similar capacity, and the CP 2.5 HO, which likely has similar capacity in actual use due to the higher current capacity, is available for $35.
Milwaukee 48-11-2425 M12 REDLITHIUM HIGH Output CP 2.5Ah Battery
https://www.amazon.com/dp/B0BHGW53W1/?tag=atomicindus08-20
Maybe that's why they're clearing out the XC 3.0?