I have the same charger as mmckenna. I have been using them for 2180/3180, 5210/5310 for several years, in both department and personal vehicles. They seem to hold up well, out of all that I have installed only 1 had issues, and was replaced with no problems with the vender. I have only used it maybe twice to top off my 5200, but not for a complete charge.
I had one of the battery contacts stick on mine, but was able to free it. I've got it mounted in one of the cabinets on the service body. I often keep a battery in it full time with no issues. They won't overcharge the battery.
Talking with Power Products, California Highway Patrol uses them in their vehicles. They have one mounted in the trunk to keep a spare portable battery charged at all times.