Deep cycle lead-acid battery
As the name suggests, deep-cycle sealed lead-acid batteries are specifically designed for deep-cycle applications. They contain fewer plates than cranks or starter plates. These plates are also much thicker. This reduces the total surface area, causing the battery to provide a lower maximum current, but can provide a deeper state of charge.
Deep cycle batteries are usually discharged to 50% of their capacity and then recharged. This is called the depth of discharge (DoD). This level of cycling is usually used in applications where the battery provides a constant current for a long time. For example, golf carts, mopeds, power banks, RV power banks, solar systems, etc.
When recommending deep-cycle batteries, the basic formula we follow is that the remaining power of the recommended battery is approximately three times the estimated daily usage. It is recommended to recharge the Sealed 12v Battery every few months to maintain its true power level. Otherwise, the battery life will be shortened, and as time goes by, the battery capacity will become lower and lower. Deep-cycle lead-acid batteries are usually classified by ampere-hour rating (AHr). Ampere hour is a measure of battery capacity.
Sealed 12v Battery has two types: AGM or GEL.
Deep cycle and start
Start or engine start lead-acid battery
The number of thin plates of the engine starting battery is more. The total current output is affected by the total surface area. The thinner the plate of each battery, the end result is that the increase in surface area will provide a higher current potential.
Generally, start-up batteries are different from deep-cycle batteries because they are specially designed to generate large currents in a short period of time. This is particularly useful in engine starting applications. Starting batteries are usually classified according to their CCA (cold start current) rating. Cold start ampere is a measure of the total current that a fully charged battery at -18 degrees Celsius can provide for 30 seconds without dropping the voltage of each battery below 1.2v (12v battery is 7.2v). Usually, this is 1% of the battery capacity. The larger the CCA rating, the larger the engine that the battery can flip.
The design of the starting battery cannot make it deeply cycle or discharge. They are designed to flip the engine and sit on the floating charge provided by the vehicle's alternator. Starting the crank battery discharge will begin to cause irreversible damage to the battery panel. This will eventually reduce its performance, extend its service life, and in some cases lead to complete failure.
Best of both worlds
It is known by several different names, but the most common is Hybrid. These batteries are designed for engine start and deep cycling. This is particularly useful in marine and RV applications, where a large starting current is required to start the engine, and the ability to periodically start equipment and appliances is required.
These batteries are available in GEL and AGM.
Spare lead-acid battery
The spare sealed lead-acid battery is the most basic battery in the sealed lead-acid series. As the name suggests, they are only suitable for standby applications operating under floating (very low) loads and can maintain uninterruptible power supplies (UPS), alarm systems, telecommunications, and network systems.
The backup battery is usually of the AGM type.
Special battery for ship
Marine batteries can be a starter, deep cycle, or both. The key factor that allows this battery to be used in marine applications is its construction process.
Ocean conditions can put a lot of stress and excessive vibration on the battery. Using a standard deep cycle and/or hand-cranked batteries in this application will produce normal results in a short period of time. However, in the long run, harsh ocean conditions, excessive vibration, and wear will damage the precision lead-acid batteries and ultimately lead to the battery's service life being much lower than its manufacturer's rated service life. Batteries designed specifically for navigation will be specifically labeled as "nautical grade". Ask the retailer if the battery you purchased is designed for use in the marine environment.
Marine batteries may be filled with glue, gel, or AGM.