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As TT mentioned, your charging system needs inspection. The symptoms you've described suggest a bad rectifier circuit (commonly referred to as the "regulator" or "diodes") in the alternator. The other possibility (and the less likely one) is a fault with the charging system wiring. You can check this yourself if you're keen by removing then connector and the ground wire from the alternator and switching the ignition to the ON position. The charging indicator should light up fully bright. At idle, the charging voltage should roughly be between 13.8V to 14.2V. Even with load (AC, headlights etc.), it shouldn't drop below this range.

.Check the alternator belt for slipping, and bat posts for loos connectins and oxide/salt build-up. You may have a prob with the charging system, to comfirm, get a volt meter and hold to battery terminals with the engine on , at slow speeds with the bat warning on. And see what the reading is,.. TT.

Hi Guys Thank you so much for all your valuable suggestions. Finally the issue was sorted out +1 Bravo ...ajm you nailed it The left rear wheel speed sensor was the culprit ,The place I went in Ampara is very good and more over they know what they're doing. I recommend this place to all eastern province drivers, the guy who inspected the car said the ECU error code is common and anyhow it will be thrown if the anomaly occurred in ABS system , but he got another sub code which describe the problem clearly (Something like L/H Rear Speed Wheel Sensor Open / Malfunction), once the replacement done voila....the ABS and Handbrake indicator gone off. Then he clear the engine check light by using the same software. Now my car is fine and yes i got the same punchy feel of the brakes there should be something coupled with this ABS problem ,once it solved the brake force also back P.S : The rear wheel speed sensor (Reconditioned) cost me 9K with the labor charge of 3.6K

I'd change to a better quality multy-grade gear oil as our country is heading to it's cool season.