Note: The following discussion on hybrid batteries refers to a battery type and not to the batteries that are used in hybrid electric vehicles (HEVs).
The hybrid battery combines the advantages of the low-maintenance and maintenance-free battery. The hybrid battery can withstand six deep cycles and still retain 100% of its original reserve capacity. The grid construction of the hybrid battery consists of approximately 2.75% antimony alloy on the positive plates and a calcium alloy on the negative plates. This allows the battery to withstand deep cycling while retaining reserve capacity for improved cranking performance. Also, the use of antimony alloys reduces grid growth and corrosion. The lead calcium has less gassing than conventional batteries.
FIGURE. Hybrid grid and separator construction.
Grid construction differs from other batteries in that the plates have a lug located near the center of the grid. In addition, the vertical and horizontal grid bars are arranged in a radial pattern (Figure 5-15). By locating the lug near the center of the grid and using the radial grid design, the current has less resistance and a shorter path to follow to the lug. This means the battery is capable of providing more current at a faster rate.
FIGURE. The hybrid battery grid construction allows for faster current delivery. Electrical energy at point “A” has a shorter distance to travel to get to the tab at point “B”.
The separators used are constructed of glass with a resin coating. The glass separators offer low electrical resistance with high resistance to chemical contamination. This type of construction provides for increased cranking performance and battery life.