DC batteries are a type of Batteries which need to add Electrolyte or Distilled water at the time of start of using the new Battery or during the normal use to recharge it frequently. These Batteries are designed for starting automotive engines, not for deep discharge. DC battery contains a mixture with varying concentrations of water and acid. There is a slight difference in density between water and acid and if the battery is allowed to sit idle for long periods of time, the mixture can separate into distinct layers with the water rising to the top and the acid sinking to the bottom. This results in a difference of acid concentration across the surface of the plates and can lead to greater corrosion of the bottom half of the plates.
| Battery Type | Nominal Volatge | Capacity 20HR AH |
Capacity Reserved Capacity (Min) |
IEC | EN |
| DIN 36 | 12 | 36 | 59 | 180 | 252 |
| DIN 44 | 12 | 44 | 77 | 220 | 308 |
| DIN 45 | 12 | 45 | 79 | 225 | 315 |
| DIN 50 | 12 | 55 | 99 | 275 | 385 |
| DIN 55 | 12 | 60 | 109 | 300 | 420 |
| DIN60 | 12 | 66 | 122 | 330 | 462 |
| DIN 70 | 12 | 70 | 132 | 350 | 490 |
| DIN 75 | 12 | 75 | 139 | 375 | 525 |
| DIN 80 | 12 | 80 | 151 | 400 | 560 |
| DIN 88 | 12 | 88 | 169 | 400 | 616 |
| DIN 100 | 12 | 100 | 195 | 500 | 700 |
