The most notable feature of these batteries is their lifespan. Not only do they provide high watt-hours for the money, but even the most modern batteries cannot compete with them in terms of lifespan. Any cheap battery of this type can easily last for over three years. While that is for the cheap versions, expensive ones can last much longer than that. In fact, large storage batteries that use this technology come with a ten-year warranty. If you are careful to maintain the health of the battery with regular maintenance, a good quality battery will last for twelve or even fifteen years.