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Both maintenance free and water batteries are lead-acid batteries, and they are also water batteries (used for starting). The so-called maintenance free means that less water is consumed during use (due to the characteristics of lead alloy). Some small businesses also suffer from maintenance free, while others are irresponsible, often causing users to mistake it. The market is full of maintenance free batteries, and there is no need to add water for maintenance free batteries. You have experienced this. The second water battery has been used for 4 years. To be honest, most starting batteries are water batteries (rich liquid batteries). Regardless of the type of battery, it is necessary to check at a certain time to see if it is lacking water. If it is lacking water, add distilled water. I think maintenance free batteries are not maintenance free. It should be less maintenance, and one more thing is to try to buy branded products.

The key is whether there is water in the battery that can flow, which makes the biggest difference in whether it leaks or not when placed tilted or overturned. In fact, there are also many small differences in electrical performance, such as the stronger power supply capacity of a hydroelectric battery in a short period of time compared to a dry battery. The advantages of water batteries: strong instantaneous high current discharge capacity, strong power, and strong load-bearing capacity. Disadvantages of water batteries: poor endurance, poor deep discharge capacity, and poor deep cycle life. Dry batteries, also known as valve controlled sealed maintenance free batteries, have the advantages of no maintenance required during normal use, strong deep discharge capacity, strong endurance, and long deep cycle life. The disadvantage is that the instantaneous high current discharge ability is poor, and it is not suitable for high-power discharge, which poses a risk of thermal runaway.

The advantages of water batteries: strong instantaneous high current discharge capacity, strong power, and strong load-bearing capacity.

Disadvantages of water batteries: poor endurance, poor deep discharge capacity, and poor deep cycle life.

Dry batteries, also known as valve controlled sealed maintenance free batteries, have the advantages of no maintenance required during normal use, strong deep discharge capacity, strong endurance, and long deep cycle life. The disadvantage is that the instantaneous high current discharge ability is poor, and it is not suitable for high-power discharge, which poses a risk of thermal runaway.

A rechargeable battery that can be refilled with water can have a lifespan that is about twice that of a maintenance free battery, but it can be quite troublesome, if it can be checked regularly and refilled frequently to ensure that the battery is not depleted.

What you mean by dry batteries is actually called "maintenance free batteries"

In fact, the electrochemical reaction in ordinary lead sulfate batteries cannot be separated from water. Whether it is a sealed maintenance free battery or a colloidal battery, water is needed to complete charging and discharging. Therefore, in fact, all lead sulfate batteries are water batteries, but the way they store water is different

1. The most common type is the so-called water battery, where the battery plates are soaked in dilute sulfuric acid. During the charging and discharging process, water will evaporate, requiring regular addition of distilled water and removal of impurities and powders deposited at the bottom

2. Sealed maintenance free battery, using paper filled with dilute sulfuric acid as the reaction carrier for the electrode plate, the advantage is that it can be used upside down. When the battery is not charged or discharged very strongly or the battery is not very hot, the battery maintains a certain degree of sealing to avoid water evaporation. However, when the battery temperature is relatively high, there is still a certain amount of water running out. After using the battery for a period of time, a small amount of distilled water needs to be added. At the same time, because there is no flowing solution in the battery, the substances peeled off from the electrode plate will not deposit to the bottom, causing a short circuit in the battery. But these substances will continue to cover the surface of the electrode plate until too much, and the battery's storage and discharge capacity will be weakened, making it difficult to clean. Therefore, some people say that maintenance free batteries are actually unable to maintain the battery

If you don't have enough experience to determine when to add water and clean battery impurities, it is recommended to use a sealed maintenance free battery. When the battery has poor energy storage, replace it with a new one

However, in terms of service life, adding water to the battery is a bit longer and the current intensity is better. My previous battery was regularly filled with water, filtered, and charged with an intelligent charging pool. It has been used for 8 years and has always been started with a battery, so its storage performance is not much worse than the new one.

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