Join Date: Aug 2006
Location: Arlington, VA
Thanked 11 Times in 9 Posts
Rep Power: 11
A modest spark is normal when connecting many chargers to a battery. As one of the posters said, it's just charging up some sizeable capacitors.
If you were to leave it connected for a few seconds, or touch it to the battery terminal a few times, you'd see the spark diminish and disappear as the capacitors came up to full charge.
You'll like the Iota. IMHO it's the best one on the market for many marine setups. It's not the mickey mouse circuit one often finds...this one is RFI suppressed, frequency and voltage tolerant, has a true multi-stage operation (with the IQ4), including a periodic "equalization" stage, uses pulse-width modulation (PWM) technology which makes the batteries very happy, etc., etc.
I've got a 45A model sitting next to me here in the ham shack which maintains my bank of T-105 batteries which power all my radios. It runs 24/7 (for over 4 years, now). Another 55A model is on my boat dedicated to the T-105 bank which powers my windlass. It, too, runs 24/7 when at dockside. After several years, the T-105's test excellent with a sophisticated battery analyzer. By far the best battery charger I've ever used. And, at the current prices, an incredible deal!