Griot's Garage 92217 Battery Manager IV

• Works on both 6 volt and 12 volt batteries
• Great for monitoring and maintaining the battery on a vehicle in storage
• Includes three different connection options with quick disconnect leads
• Compatible with standard lead-acid batteries as well as AGM batteries
• Quad-phase charging process

I bought the Battery Manager IV over a year ago, because my car often sits for extended periods of time without being driven. And I got tired of the battery dying, needing to get a jump or push-start the car, and other such inconveniences. And I can tell ya that ever since I purchased and have been using the Battery Manager IV, these frustrations have been a thing of the past.

It actively takes the battery up to 14.4V to fully charge it, then enters the float mode to maintain the battery's full charge at 13.5V (as opposed to cheaper units that keep driving 14.4V into a battery during long term float, actually damaging its life).

Also of note is that it'll charge a battery connected to the car, a solo/disconnected battery, and even a dual-battery setup, as I have in one of my vehicles.

One thing I did find out about this unit, however, is that the battery must already have and be able to maintain a minimum charge for the Battery Manager IV to work. Ie, this unit will NOT be able to charge a completely dead/drained battery. That battery will have to be charged for a bit (or, after a jump, drive around for a while for the alternator to charge the battery some), THEN the unit will take over, recharging the battery to its full capacity.

All in all, this unit does exactly what it claims to do, and it does it well. I am very happy with the purchase, and wouldn't hesitate to purchase a second unit for my other vehicle. The only reason I didn't though was I decided to go with Griot's 3-In-1 Battery Charger/Maintainer/Tester (Part #77495) so at least one of my units can charge a fully discharged battery, AND test it too!

Buy Griot's Garage 92217 Battery Manager IV Now

We liked the first Battery Manager so well, we bought another one! One of our vehicles sits for long periods of time without being driven, and we have found that this works like a champ to keep the battery topped off. The second one lives at the beach house, to keep the vehicle there charged up when we aren't around.