Operation batteries used on board the ship are very different from the conditions of any other batteries. First, they operate under constant rocking, at times very strong. Second, for marine batteries are more likely contact with water. And thirdly, many vessels do not operate in winter, and hence the battery can be recharged. These special conditions make on-board batteries are special requirements. Not surprisingly, the use of on-board batteries not intended for this purpose, such as automotive, inevitably accompanied by more or less serious problems. The most common complaint in this case – a very short battery life and associated costs for their frequent replacement. High-quality marine battery is rated for four years, while Many cheap its brethren need to be replaced once a year and a half or even annually.
Rough estimate of marine life battery can be claimed on the number of charge / discharge cycles. Please note that many Manufacturers are cunning, indicating the number of cycles when tested in standard conditions, and it is overpriced. Another common problem of substandard batteries – it's too fast to self-discharge. There can be several. For example, savings in the production of lead plates of lead-acid batteries, or savings in production process, since it is not only the mass of the lead plates, but also their shape and location. Thin cheap housing can easily crack from leakage acid, and furthermore, contributes to the rapid self-discharge due to poor insulation. Has a value and quality of manufacture of the battery.