BALDR 12V Solar Battery Charger, 13W Waterproof Dual Sided Battery Maintainer, IP67 MPPT Trickle Charger for Car, Trailer, Lawn Mower, Boat

“Trickle” charge means very slow; solar charged
This charger is not the typical car battery charger. I got this thinking that when the power is off, I might need this to help get through until the power is back on. This charger is described as a “trickle” charger. That means it charges over time. I put this on a a lawn mower battery that was about dead (initial charge 0.4). After 2 days of charging, it was 0.3. I thought the charger wasn’t working. So I tested the charger and found that the charger registered 14.6 in the full sunlight. The charger works, but not very fast. That’s what you need to know about this charger. It’s big, has a larger solar panel, illuminates green when it’s in the sun. You can angle it to catch the full sun, and it comes with clips to attach to a battery. It’s a great device, it’s just not fast acting. I would have given it a 5 if it charged faster.

Very Functional Charger of Extremely Good Quality
I have owned a few of these types of chargers/maintainers over the years. They are relatively small, as solar panels go. Solar panels in general are not overly efficient and power output is strictly limited by size. Small necessarily equals lower output. But assuming you are using these to maintain already charged batteries and there are no electronics, etc. attached to the systems which is draining it they will more than compensate for the natural power loss over time of a sitting battery. It’s important to remember, if calculating whether such a device will work for you or not, that with solar chargers, assuming full sun light under the best circumstances, the rated output is available only during a window of time each day, and assuming cloudless conditions. This means that the rated 13 watts will only be available 5 – 6 hours a day.The above explained and to set expectations, this solar battery maintainer is hands down the nicest I have tested as to overall quality and durability. It is extremely well made and designed. It is very solid feeling. The solar panel is of a bi-facial design, which adds to efficiency under the proper conditions by allowing reflected light to also illuminate the rear of the panel. This can boost output by 15 – 20% under ideal conditions.This unit can be attached to a vehicle’s painted surface or window glass via the included suction cups, or using its included fold out stand. It is quite heavy as these types of devices go. That is not a negative comment. It is made of a very good grade of ABS like plastic, not the usual hard plastic found on many of these devices. It is not designed to be a portable, as in carry around type of device. So, in my opinion the added weight is a plus, especially if using the fold out stand method of placing the unit. The weight will counteract a moderate wind attempting to blow the unit over during use. It includes four optionally used corner mount suction cups, as well as an integral generous length primary power cord. This cord can be terminated with a cigarette lighter plug or a pair of allegator clamps for battery terminal connection. These are also of very good quality. The included MPPT charger regulator seems to do a good job of maintaining a steady and appropriate voltage during use under full sunlight.Overall, this is a great device for its intended application. The price is in the range with other such units I have used and tested, maybe even a little lower. But the quality is several large steps above those. So, in my opinion it represents a very good value. The only possible addition I could recommend would be for the manufacturer to include a storage bag to protect the unit and keep the accessories together. Most users will be transporting this device in their vehicle or otherwise storing it when not in use. So, that would significantly add to convenience. Everything considered this is a great device and it’s easily worthy of five stars.

Well made and reasonably priced
I ordered this in order to keep a vehicle charged as it sat for four months while we were at our winter home. It was sent to our winter address so we didn’t use it for what it was intended, but we were still able to inspect it and try it out. The charger is well made and functions better than expected for its smaller size. It was tested on our golf cart, which we connect to a charger every night after heavy use during the day. Using this, the batteries held their charge so we are confident that it will work the same on the vehicle in our summer home.