How often should I charge my batteries?

Starter Batteries: Owing to the harsh starting conditions (high discharge for the initial start and then high charge currents from the charge alternators for a rapid recharge) and bearing in mind that they are positioned near an engine, means that starter batteries do not have the lifespan they would have if they were connected to a UPS. Battery manufacturers therefore do not provide a recommendation for changing. We can, and do advise, depending on the battery type, environment and application. A reminder to change batteries can be set in most cases to the UPS operating software.