Hey guys I had #4 ENEL4 batteries for my Nikon camera and over the years 3 have died, so I’m now down to 1 battery.
I looked on B&H site and a genuine Nikon battery is $110 US plus postage to Australia so I’m thinking about $170 AUD
A cheap one on eBay is about $60.
I thought I would open one up and see what's inside and I was surprised to see that there was 3 x 18650 batteries which I have about 30 of.
So got out the soldering iron removed the 3 dead cells and soldered in 3 new ones.
Took a bit of time and being very careful not to touch the circuit board with the hot iron but now I have 3 batteries and I’m going to do the 4th when I get time.