Smart charger for sealed lead acid batteries based on parallel port PC interfacing

Nowadays, the needs to backup electrical resources have increased widely and progressively, so these resources represent an important factor for reliability and continuity of any effective system. The rechargeable batteries (RB) are the most resources used as backup resources, for examples: lighting, solar power systems, test instruments, UPS´s, cell-phones, notebook PC´s, portable tools and large range of applications. Because of above uses, it is interested for studying the rechargeable batteries, with their different types and specification. To use these batteries safely and protect them from the damage and deep discharging, we had designed and implemented an electronic smart charger with capability of monitor the level of charge (LOC) of battery, in addition to this function, also another circuit was designed to protect the rechargeable batteries from deep discharging and resulting in avoid battery fault, damaging or even explosion.