1. Inadequate first charging or long interruption time of charging;

2. No sufficient charging for long time;

3. No timely recharging after discharge;

4. Often excessive charging or deep discharge with small current;

5. Electrolyte density or temperature is too high so that lead sulfate will form and hard to decompose.

6. Lay the battery aside for a long time and without any regular charging;

7. Electrolyte is not pure and large self-discharge;

8. Internal short-circuit or leakage of electricity caused by the water on the surface of battery.

9. Barely plate partially sulfated because of low Level of internal electrolyte liquid surface.

Advantage: low price: the price of lead acid batteries is just 1/4~1/6 of that of other types of batteries with a lower investment which most users could bear.

Disadvantage: heavy and bulk, low specific energy, strict on charging and discharging.

Lead acid batteries are 100% recyclable. Lead is the most recycled metal in the world today. The plastic containers and covers of old batteries are neutralized, reground and used to the manufacture of new battery cases. The electrolyte can be processed for recycled waste water uses. In some cases, the electrolyte is cleaned and reprocessed and sold as battery grade electrolyte. In other instances, the sulfate content is removed as Ammonia Sulfate and used in fertilizers. The separators are often used as a fuel source for the recycling process.

The most common battery rating is the AMP-HOUR RATING. This is a unit of measurement for battery capacity, obtained by multiplying a current flow in amperes by the time in hours of discharge. (Example: A battery which delivers 5 amperes for 20 hours delivers 5 amperes times 20 hours, or 100 ampere-hours.)

Manufacturers use different discharge periods to yield an different Amp-Hr. Rating for the same capacity batteries, therefore, the Amp-Hr. Rating has little significance unless qualified by the number of hours the battery is discharged. For this reason Amp-Hour Ratings are only a general method of evaluating a battery's capacity for selection purposes. The quality of internal components and technical construction within the battery will generate different desired characteristics without effecting its Amp-Hour Rating. For instance, there are 150 Amp-Hour batteries that will not support an electrical load overnight and if called upon to do so repetitively, will fail early in their life. Conversely, there are 150 Amp-Hour batteries that will operate an electrical load for several days before needing recharging and will do so for years. The following ratings must be examined in order to evaluate and select the proper battery for a specific application: COLD CRANKING AMPERAGE and RESERVE CAPACITY are ratings used by the industry to simplify battery selection.