Discount Duracell D2A 2 AMP 12V Battery Maintainer / Charger

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List Price: $29.99
Sale Price: $25.51
Today's Bonus: 15% Off

I wanted a charger to keep my car battery charged (but not overcharged!) while I am absent on multi-week trips. So far the Duracell 2 Amp charger seems to be working well.

It is a three-stage charger. The specification says that depending on the current state of the battery, it will do a fast charge to around 80%, then a slower charge to almost full, then finally move to a lower voltage "floating" charge to keep the battery near 100% without overcharging.

I used a multimeter to watch the charging process. My battery was mostly full to start with, so the charger started charging at 14.1 volts (the slow charge mode) and then after a few hours moved to 12.7 volts (for the floating charge). These both seem appropriate voltages. In particular, the floating voltage of 12.7 volts should be safe for long-term battery maintenance.

After about two days on floating charge, my charger's red charging light finally went off. Over the next couple of weeks, when I checked the charger, the red charging light was mostly off but I occasionally noticed it on. It looks like the charger is moving between off and floating charge as needed for sustained maintenance.

I'll have to see how the charger holds up under long-term use, but so far everything looks good.

Update November 2010: I've been using this for two years now and I continue to be very happy with it. It's pleasant to come back from a four week absence to a fully charged car battery, with zero hassles!

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I use this with my classic motorcycles and it's taken a beating. Gotten soaked and dried out. Fallen to the concrete floor on numerous occasions, and it's still running like a swiss watch.

All the connectors are great too.

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This product is great!! It also has a low price.

I bought this for the cold winters here in Iowa. I have older cars they are 96, 92, 01. I just connect them through the lighter option connection and switch them every day.

My cars always start now. No problems at all.

This charger/maintainer is perfect for older cars that tend to lose their charges during cold sub zero cold nights.

Would highly recommend!!!

Honest reviews on Duracell D2A 2 AMP 12V Battery Maintainer / Charger

Product works as described. Connect and forget. Plenty of connection options,I especially liked the connector covers on the ring terminal connectors.

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The Cigarette Plug/Power Outlet Plug is the best feature. Most battery retainers come with clamps requiring the user to open the hood and clamping the leads to the battery and a body part. This unit plugs directly into the cigarette lighter/power outlet. As the amperage is greater than the drain on the battery (the battery is always draining because it is hooked up to the car), the electrical flow goes toward the battery and it keeps fully charged! No brainer to use. Note: if the power light does not light up when it is plugged into the AC send it back right way via Amazon.com return.