Battery Tender 1.25 Amp vs 4 Amp vs 5 Amp- Quick Comparison

Batteries are essential in starting the car and hold a charge for a long time. Everyone desires to have a battery that holds a charge for a long time, and luckily batteries such as battery tenders can hold a charge for a long time and keep functioning as usual.

The battery tender has many characteristics, such as being smart enough to know when to maintain the battery. Also, they have some differences, and the article below shows different features, similarities and recommends the best battery tender.

A quick comparison table for the three battery tenders

Features Battery tender 1.25A Battery tender 4A Battery tender 5A
Model, size and weight 9x4x11inches and 1.30 pound  69×3.3×1.91inches with 2.6 pounds 8.2×3.9×2.3 inches with 1.5 pounds
Charging rate in amperes 1.25A 4A 5A
Voltage support system Charges only 12V system Charges both 6V and 12V system Charges only 12V
performance Has thermal compensation that regulates temperature Acts as a primary source Acts as a primary source but maintains charged battery
Supportive features Charge small ampere batteries Charge large ampere batteries Charge large ampere batteries

Main differences between battery tender 1.25A, 4A and 5A

1. The model of the battery tendersBattery Tender 1.25 Amp vs 4 Amp vs 5 Amp

Since the same manufacturer manufactures the batteries, they have the same appearance; hence challenging to differentiate them. There is a slight difference between them; for example, they have different measurements. A 4A battery tender measures 69*3.3*1.91 inches, a 5A have a size of 8.2*3.9*2.3 inches, and lastly, a 1.25A battery tender has a measurement of 9*4*11 inches.

Also, the battery tenders differ in terms of weight. A 4A is the heaviest compared to the other two. It weighs approximately 2.60 pounds, whereas a 5A weighs about 1.50 pounds. Finally, a 1.25A battery tender weighs around 1.30 pounds. Therefore, when choosing a battery tender for your battery, consider the measurements and the overall weight to get one that suits the battery perfectly.

2. The Rate of chargingThe Rate of charging

Each battery tender has a different charging rate where a 1.25A can only charge at a speed of 1.25A, a 4A can charge the only 4A, and a 5A can only charge a 5A battery. Battery tenders with high amperes can charge car and SUV batteries, while a 1.25A battery tender can only maintain the car and the SUV system without charging them.

A 4A battery tender ca1n charge 6 to 12 volts, unlike 1.25A and 5A. The charging rate is an important feature to consider when choosing a battery tender for your devices such as motorbikes, toys and ATV’s batteries. If you are charging a smaller device and require fewer amperes, such as a 1.25A, charging a larger device, a 4A and a 5A is suitable.

3. Charging 6V and 12V systems

All three battery tenders can charge a 12V, and only a 4A battery tender can charge both a 6V and a 12V system without any challenges. The ability to charge different voltage systems is most applicable when you only need one charger to charge all other systems and reduce the cost of buying many chargers. It is advisable to choose a 4A battery tender to charge many autos, marine, and motorcycles systems.

4. Wakening dead batteryWakening dead battery

Despite all the three battery tenders performing the same function, all of them cannot recondition a dead battery to last longer than usual. Also, all battery tenders can act as a primary power supply source and not secondary since their ability is to only keep the battery functioning by charging and maintaining efficiency.

Even though the battery tenders cannot act as a secondary power supply source, a 1.24A battery tender has a unique characteristic of thermal compensation that regulates the voltages according to the temperature in the external environment. A thermal compensation ability is efficient if you are living in an environment with high-temperature fluctuations.

5. Supportive featuresSupportive features

Each tender battery charges according to the amperes which they support. For instance, a battery tender with amperes of 1.25 cannot charge systems or vehicles with larger amperes but can only maintain them efficiently. For battery tender with 4A, they can charge larger devices such as cars or any systems supporting high amperes.

Finally, a 5A battery tender has larger amperes to charge a car battery or any other device supporting 12V. Also, the battery tender can only maintain an RV battery, unlike 1.25A and 4A battery tenders. Therefore, it is advisable to consider your device’s voltage and ampere capacity before buying a battery tender.

Common features between battery tender 1.25A, 4A and 5ACommon features between battery tender 1.25A, 4A and 5A

Although the chargers have different features, they contain the same characteristics as they are safe and can last longer. The standard features across the three chargers are as shown below.

  • Safe characteristics

Sometimes, the battery may start overcharging or charge in different polarities, especially when hooking the clips in an unwanted direction. Therefore, the chargers perform the function of preventing such electrical charge issues. Once the battery starts overcharging or charging in reverse polarity, the charger does not allow the power transmission to the battery protecting the battery from faults.

Also, the chargers automatically shut off once the battery is fully charged or almost to protect the batteries from overcharging. Moreover, all three chargers can detect when the battery is being overcharged, overused or any faults. The charger sends a signal by flashing light indicating that the battery is unsafe for use unless the issue is resolved.

Further, the chargers have a case around them that protects them from dust and dirt accumulation. The chargers have a safety feature of protecting the battery against electrical issues such as sparks. Finally, they can detect nearby flammable liquids that may destroy the charger and the batter. Therefore, it is advisable to avoid charging the batteries near flammable liquids or gases such as propane but rather charge in a free environment away from any flammable substances, not only the liquids and the gases.

  • The way of connecting to the battery

All the battery tender chargers have the same connectivity method. You connect the charger to the battery with running lead via the grille and connect the charger without opening the hood each time and leaving the battery to charge until complete. Also, you may run the leads through complicated bodywork and leave the battery connected on off-road equipment. 

  • The Rate of charging

The three battery tenders usually charge similar vehicles with different models. For instance, the battery tenders can charge motorcycles, ATV batteries, among others. Despite the battery tenders charging the same cars, 4A and 5A can charge car and SUV systems since they can withstand high voltages, unlike the 1,25 battery tender. The 1.235A battery tender can only manage and maintain the vehicles charged by the 4A and 5A tenders only, such as the car and the SUV system.

The best battery tender between battery tender 1.25A, 4A and 5A

Battery tender 1.25Amp is the most recommended since it comes at a lower price and it is portable. The best battery tender 1.25Amp is battery tender plusv1.25A 12V battery charger and maintainer.

Frequently asked questions:

Yes. You can leave the eyelets connected to the battery tender terminals no matter how you prefer charging the battery or not, considering whether the charger is hooked up.


Each battery tender usually maintains and protects the car battery from any faults such as overcharging and overusing. When choosing a battery tender for your device, it is advisable to consider all the above features such as connection method, charging rate, devices which the battery tender can support, the size, among others.

All battery tenders usually have a warranty of approximately five years and if not, avoid buying battery tenders with limited or no warranty. Finally, choose a battery tender that suits your device.

A low maintenance design that’s quick and easy to use, our universal powersport battery charger is lightweight and compact allowing it to operate everywhere, even in small storage spaces.

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