None of the locally available battery chargers are any good. Even Chinese ones aren't that great. Lead acid batteries require very precise voltages to charge, and go through bulk, absorption, and float charging stages. Bulk charging is constant current, absorption is constant voltage (14.4V - 14.7V) and float is 13.20V, with temperature-dependent voltage compensation. If you examine a locally-sourced charger, you'll find they don't have nearly enough components to monitor or manage these variables.
Also note that your car battery is not a "deep-cycle" battery, meaning if you're letting it get very very low, it can only handle about 10-15 full discharge cycles before it irreversibly loses capacity and becomes unserviceable.
However, SIMTEK, I believe, makes a 12V battery charger that may be decent. I have not examined one myself, but I own a SIMTEK UPS that has decent construction and quality components.
Good quality imported chargers such as the Noco Genius may be available abroad.
You might be served well by a battery "tender" - a trickle charger that keeps the battery topped up.
