For the price of just one original battery, you get three (!) And a 3-way charger on top of that.

I use several A7IVs with 5 original Sony batteries, the new K&F replace my old RAVPower and Evatronic... all my batteries are around 3 years old. With the latest firmware 6.01, there is NO warning message when the battery is inserted (I have no idea whether they use the same chips for all batches), the percentages are displayed. Charging current per slot depending on occupancy: 1x 850 mA, 2x 550 mA, 3x 350 mA Tested

all my batteries, high energy consumption mode with Sony A7IV - 4k video at 25 fps 10bit with 8 series PP and 140 Mbit, MF.

Average values:
Sony 2h02min (5 pcs)
Ravpower 1h42min (2 pcs)
Evatronic 1h43min (1 pc) K&F *NEW* 2h03min (3 pcs) I guess (!)


that the K&F will have similar values as my old third-party batteries after the same period of use - so guess (!) I set the performance in relation to Sony at 80%. That means you get almost 2.5 times the power AND a charger for the price of an original battery. That is great. Long-term experience is yet to be seen, this is a snapshot of the new product - I'll update my review just in case.

Current: Buy recommendation 5/5