I have been using the latest charger/maintainers from Vexilar that they ship with the new models. I love em. I think they work great and really like the convenience of the connector.
That being said, I recently picked up an ICE 55 and was unimpressed with the charger that came with it.
I really wasn't happy with the alligator clips and I wasn't sure if I could leave it plugged in all the time without overcharging the battery.
So I found this Noco Genius G750 on Amazon for about $30.
http://www.amazon.com/NOCO-G750-Battery-Charger-Maintainer/dp/B004LX3AS6/ref=sr_1_7?s=automotive&ie=UTF8&qid=1390950111&sr=1-7&keywords=battery+maintainerIt's a charger and maintainer with a nice little quick connect harness.
This would be a nice little upgrade for any flasher that doesn't come with a charger/maintainer.
It works out great. Just add a couple female spade connectors and you can leave the female end of the harness attached to the battery and tuck the connector away in the side pocket of the case for easy access.