Green ExtremeNP-FM500H Lithium-Ion Battery Pack (7.4V 1450mAh) Replacement Battery for Sony NP-FM500H / NP-FM500

I don't shoot much, generally a flurry of 8 or 9 hundred images taken during one of our 6 week back country tours, then throughout the rest of the year another 5 or 6 hundred images. I bought a pair of these batteries a year ago. At first they held a charge good enough to last 200 or so clicks. Now, after only 4 or 5 charges they might be good for 30 or 40 images. The two old Sony NP-FM500 batteries still out preform the Green Extreme after nearly 10 years of use. Next time around I'll be buying the OEM battery.