I wondered if anyone else has used the Deltran 4 amp charger. I recently bought one and something does not seem right about it. I have 2 vehicles that are not driven much and the battery voltage will drop to the 12.3 range after a month. I had been putting my Deltran 1.25 amp on them, but it takes 2 days to top them off. That's why I got the 4 amp. Anyway, the 4 amp will charge for about 10 minutes and the green light will blink, indicating 80% charge. After another 10 minutes it will be solid green indicating full charge. I don't believe this can be. I would think it would take at least 5-6 hours or more to fully charge.