lead-acid battery charger

Although in electronics more NiCd than PbH2SO4batteries are used (or so we"re told), there is still a healthy demand for good chargers for the lead-acid types. The present one enables 6- or 12-volt types to be charged rapidly; switches itself off automatically; and is protected against thermal overload, short cir- cuits, and polarity reversal of the battery. If you are not fully acquainted with modern sealed lead-acid batteries, here are some of its more important properties. It may be used in any pos- ition, even upside down. The charging voltage should be 2.3 V per cell (2.45 V for fast charging): i.e., 6.9 V for a 6 V battery and 13.8 V for 12 V types. The charging current need not be limited to 0.1...1 C (=capacity in Ah — the actual figure depends on the manufacturer). The battery is charged when the charging current has dropped to 1 per cent of the capacity. Some manufacturers state that it is-preferable that their batteries lead-acid battery charger 7-73 1 Fl 100mA Tabl...