The third biggest issue with the DC 30 (and this really went back to the DC 20) was the design of the charging port. The original Astro collar used a charging plug that allowed dirt, grime and muck to get lodged inside the grooves where you plugged the charger into the collar. This would cause issues with the charging and required that you cleaned out the grooves from time to time. It also made it difficult to tell if your collar had really charged. If you were not paying close attention to what you were doing, you could plug your collar up, not get a good connection and not know it. I did this myself on more than one occasion.
The problem with the DC 30 charging system was that it didn't do a good job of telling you when the unit was finished charging. What would happen is that when you plugged up the unit to the charger, the light on the transmitter would turn on. When it was finished charging it would turn off. Sounds simple enough- right?
The problem with that is if you plugged the charger in and you didn't get a good connection, the light would not turn on at all. If you were not really paying close attention and didn't notice that the light didn't come on at all, you would come back a few hours later and "think" that your system had charged since the light was off.
Garmin has completely eliminated both of these issues with the new charging system in the Astro DC 40. To fix the dirt, grime and gunk issue, Garmin has gone to a snap on flat contact charging interface. Plug the charger into the wall and snap it to the collar. Simple as that. If you get any dirt on the collar you just wipe it off. There are no grooves for it to hide in or get trapped. The charger contact points are smooth and flat.
The other new improvement in the charging system is that the lights now tell you when your collar has a complete charge. When you snap the charger to the collar, the light flashes blue while it is charging. When it is finished, the light glows a solid blue. If you are not getting a charging connection, there will be no light.
It's as simple as that.
This improvement in the charger is one of those things that I have wanted since the original DC 20 came out. I run a lot of dogs and at the end of the day I have a bunch of stuff that needs to be charged for the next day's hunt. I am normally tired at the end of a long day, and I don't need to have to think about my collars. I need the charging to be simple, easy and fool proof. Garmin has made a simple change that really improves the product.