Red flashing light

I just installed 6 new Gem Gel Batteries in my 2002 E2. The old ones were no longer holding a charge. When I plug it in and turn on the key I get a loud beep and the red light flashes, any ideas?

Hello. This comes up pretty often so you can bet a search of the forum will turn something up. I found this link that should help out if you have the Zivan charger that the 2002 usually came with. Sounds like a bad connection someplace -