In recent years, the capacity of batteries has increased steadily. NiMH, LiIon, NiCd, lead-acid batteries. All of these types need special chargers. Here you will find corresponding schematics.

Here you will find Schematic Circuit Diagram for DIY and further information on Battery charger
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Charging circuit for lead batteries and trickle charge	www.uoguelph.ca/~antoon/circ/bcgla2.htm