Battery Tender4 AMP Battery Charger and Maintainer - Automotive Switchable 12V or 6V Smart Automatic for Cars SUVs and Trucks - Lead Acid, AGM, Gel, & Lithium Battery Charger - 022-0209-BT-WH

I have been using this battery tender on my boat for quite some time. My batteries always stay fully charged thanks to it. The tender maintains the batteries even through the cold winter. Come spring time i'm confident in taking my boat out onto the water again. Additionally I have never worried about overcharging the batteries because this tender has built in safeguards against it. It's been a solid purchase and I would recommend it for Boats, lawn equipment and anything else Having a 12 volt battery system.

This 4 AMP battery charger works great! It’s super easy to use. You really don’t need the instructions for the most part. It’s a very good value for the money.

Great product, only used so far once!

The Deltran “Battery Tender” is a lifesaver. The service advisor at our local dealership told us that he uses this exact charger for his old BMW that he never drives. We are in a similar situation, and I wanted something that I knew is safe for the complex batteries they put in newer cars. Since one of our cars sits in the garage for 90% of its life, maintaining a full battery seemed impossible. The Deltran solved the issue.I think the biggest thing I like about the “Battery Tender” is it is a smart charger. Once the battery charges to full, it turns into a trickle charge to maintain the battery power level. Having a smart system keeps the charger from overcharging your battery. The new car batteries are not inexpensive, so protecting and maintaining them is a must. I love the fact that it is easy to connect and use, and as long as you know the positive and negative terminals for your battery (and don’t mix them up), this charger is pretty idiot-proof. Highly recommended!Pros: Easy to use, recommended to me by a car expert, and priced well for what you get. The “smart” charging function is fantastic.Cons: None!

Working fine.

This Battery Tender has been working great thus far. I primarily use it to keep my RV Batteries charged when stored throughout the winter months. I will occasionally use it for my lawnmower battery. I docked it 1 star simply because it wouldn't charge a Lithium Motorcycle battery. I connected it and after powering on the Tender, it automatically selected AGM. I tried to manually switch it to Lithium, but it wouldn't switch. After doing some Google research, I found that many people have issues getting the Tender to charge Lithium, even though it clearly says that it can charge it. It may have charged it on the AGM setting, however I didn't want to risk it on such an expensive battery. This Tender works great for most applications, but if you're looking to charge Lithium, I would go with a Lithium specific charger for it.

Perfect size for our use. Cold weather we need to make sure vehicles are good to go. Medium price for unit. Easy to use. Can read it without glasses

Lite weight