If your remote drained until no light comes out, is remote faulty.

If range is very short until like stick to car there, sometimes is interference from mobile station, you can try it again at other place.

Where did u get the battery for replacement? Have you checked whether the battery expires? I have similar experience whilst after changed it only last a day or 2, then the battery drained and can't be use anymore. Until I got fedup go order online batteries, sent to my house & I had them changed by myself, then no plobrem liao.

both remote? battery problem. check battery voltage = 3 volts per cell.

both keys? o.O 

car still under warranty?

I'm affraid the alarm system is only 1 year if I am not mistaken.

Plotong produce rubbish is a well known fact, but alarm module in the car causes your remote fob drain battery is absurdly unbelievable to me. Either your magician is a xingahlan trying to ask you change alarm module which will cost you a bomb because our car got immobilizer spidered with the ECU and fuel injection system. If anything goes wrong during transplant of alarm unit, there's a chance u fry the ECU and will result in few thousands of damage. Or, your magician trying to say your remote fob sudah rosak, but you misunderstood as ALARM MODULE rosak.

From what I see, I'd rather think it's the battery u changed rosaked. Why not like goohtj say, go Mr.DIY buy 1 row go back change by yourself?

maxwell mia pasal...

cc @titanrev

Apa o. 

I just had a look at my key battery and mine is a CR-2032, the issue could be the CR-2016 can't provide enough current to work reliably even if it's likely to fit and contact the terminals fine. LED lamp makers take advantage of the limited ability of the CR-2016 to make lights very simple, so they must only output 20 mA or so. With the CR-2032 having double the thickness it may output nearly twice that.