One fix is to peroiodically charge it with a bulk charge wake up. However, experience shows us that the battery held on a low voltage over long periods (floating) will affect the electrolyte partical to partical conductivity increasing the internal impedance and reduce performance to eventual failure. To float the battery, the voltage will drop to approx 13.5v - model dependant, to discourage paracitic internal discharge. The fully charged battery, indicated by the low amperage drawn from the charger, generally will trigger a 'float' mode. Ideal for moored vessels, seasonal agricultural equipment and vehicle restoration projects. The adaptive charger is ideal for retaining and holding a battery in a fully charged state over prolonged periods. This process will guard against stratification (the electrolyte settling into layers of different concentration) Many battery advisors will recommend the battery be equalised every 4 or 6 months to ensure all cells are fully charged which also promotes de stratification. Periodically, the charger will click from float mode back to bulk mode for a brief time and then back to float.
This will minimise the recovery period with minimum electrolyte loss. This will maintain a given voltage and reduce current as the charge comes up. The charger will automatically click into the next stage. Often over a given time frame, the charge rate is at a constant amperage for fast recovery up to about 80%. The adaptive charger essentially has 3 steps - Bulk, Absorption and Float and sometimes as many as 8. Known for its ability to adapt to the state of charge and condition of the battery. The modern charger will automatically move into float mode and reduce the charge voltage. However, the automotive charger can be low in price but must be managed. If left on through an extended time frame, the electrolyte will evaporate to a dangerously low level - the battery will overheat and internal damage will result. However, this has been addressed these days with the Constant amperage / Constant Voltage algorithmsĪlso bear in mind, that gassing (boiling) of a lead acid battery occurs at 14.4v (at average temperatures) with exception of the Calcium battery and some earlier automotive chargers are insensitive to this. As the state of charge increases, so does the rate of charge slow and the last 20% of the charge is really slow. Loosely speaking, an older automotive charger has a fixed voltage (say 14.7v) and the amperage reduces as the battery voltage equals the charger voltage (water finds its own level). Most modern chargers have a selection switch for flooded / AGM / calcium or Gel. The Gel battery uses lower voltages than the flooded and AGM units and the calcium battery (maintenance Free) has a higher voltage. This will guard against sulphation, a process that will reduce the battery's ability to perform to its maximum specification. It's important to keep the battery in a fully charged state whether its being used or not. Charging your battery must be done with the correct equipment and to achieve this there are many chargers available to us.
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