Using this circuit will give Good Charging results to a Gell Cell

or SLA type Batterys as used in my Metal Detector project.

And it can be modified to accomidate higher current batterys.

It is Probably quite Suitable for up to a 10 A/H Rating

This charger is both Current and Voltage Regulated.

The Output is NOT short circuit protected,

However the current limit is effective if the output is above a 2 volt

potential.

It is also protected against discharging the battery,

by a diode, if the input power is removed. 
 http://www3.telus.net/chemelec/Projects/Charger/Charger.htm
 
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