Originally Posted by jeff-o

Ever since I got my charger, the battery in bay 1 would always show "3.7Ah" when it was fully charged. Obviously, this was incorrect but I decided to let it go. Spurred by this thread and a quirk I noticed with my own BC900 charger, I decided to open the thing up and take a look.

Improperly soldered joints! Solder bridges! And, a missing part! I'm an electronics technologist by training so I know what I'm looking at. I fixed the bad soldering, cleaned all the old flux residue off the board, and set to work on that missing part. Guess what? It was part of the circuit for the first battery bay. Each bay has the same group of parts, and I determined that the missing part was a 1000 ohm resistor. Once soldered in place, I put everything back together. No more 3.7Ah reading! Yay!

I must say, while the operation and design of this charger is pretty good, the quality control is severely lacking. I won't be so quick to recommend it should anyone ask.