Temperature can have a significant impact on the internal resistance of a lead acid battery. Higher temperatures can decrease the resistance, resulting in better performance, while lower temperatures can increase resistance and decrease performance. How can the internal resistance of a lead acid battery be measured?
As the capacity of lead acid battery decreased or the battery is aged, its internal resistance will be increased. Therefore, the internal resistance data may be used to evaluate the battery’s condition. There are several internal resistance measurement methods, and their obtained values are sometimes different each other.
In summary, Lead Acid Battery "Internal Resistance" and Temperature are both important factors to consider when charging a battery. Charging strategy for a lead acid battery is a delicate matter and depends on a variety of factors, including battery voltage, state of charge, and temperature.
Only at very high ambient air humidity (above 70%), water from outside the battery can be absorbed by the hygroscopic sulfuric acid. In summary, the internal temperature of any lead-acid battery (flooded and AGM) should not exceed 60 °C for extended time periods frequently to limit vaporization. 2.1. External and internal heating of the battery
To maintain battery health and prevent rapid degradation, the use of batteries at high temperatures should be avoided. In that relation, studies involving battery internal resistance are mostly conducted in an ideal temperatures range. This makes data on internal resistance at high temperatures scarce and insufficient.
Taking three full charging lead-acid batteries with a similar performance to discharge, as shown in Fig. 4, the change of internal resistance under different current for discharging has the same trend. Obviously, the battery internal resistance increases faster along with the enhancement of discharging current.