Quick Answer
Age can affect the depth of discharge limits in lead-acid batteries, as the capacity of the battery decreases over time due to factors such as sulfation, grid corrosion, and internal resistance increase.
Age-Related Capacity Loss
As lead-acid batteries age, their capacity to store energy decreases. This is typically due to the formation of lead sulfate crystals (sulfation) on the plates, which reduces the surface area available for chemical reactions. According to the Battery Council International (BCI), a typical 5-year-old deep cycle battery may exhibit a capacity loss of around 20-30% compared to its original capacity. At 10 years, this loss can be as high as 50-60%.
Depth of Discharge (DOD) and Age
When a battery is discharged to a certain depth, it can be difficult to recover its full capacity. As batteries age, they become increasingly sensitive to DOD levels. For example, a new lead-acid battery may be able to handle a 50% DOD without significant damage, but an aged battery may require a reduced DOD of around 20-30% to prevent excessive wear and tear. In some cases, an aged battery may need to be limited to a 10-20% DOD to maintain its remaining capacity.
Find more answers
Browse the full Q&A library by topic, or jump back to the topic this question belongs to.