Battery Overloading

One day my R2 jeep won't seem to start.  The engine would crank but it cannot start.  It seems that the battery was not giving enough current to the starter motor.  Before I went to the mechanic I googled on when should the battery be replaced and these should be the criteria. 

• Battery Life.  The Motolite website says their batteries lasts 2 to 3 years while in low climate countries batteries lasts up to 5 years.  My battery is 3 plus years already and fits this criteria. 
• Off-Engine Voltage Level.  When you measure the voltage across it's terminals when the engine is off it should read at least 12.6 Volts. 
• On-Engine Voltage Level.  When the engine is running it should read at least 13 Volts to 14.5 Volts.  My battery still has 12.6 Volts and since it wouldn't start I cannot read the voltage while the engine is running. 
• Starting Voltage Drop.  Another criteria is that if you monitor the voltage before and after the engine is starting the voltage drop should not be less than 3 volts.  I was not able to do this since I was in a hurry since it's getting late in the afternoon and wanted to really know if it is the battery that's failing. 

After consulting a mechanic it finally turns out that my battery was old and does not have the current carrying capacity to crank the engine into a start.  Good thing that Motolite has a free delivery service plus a free check-up.  I also traded-in my old battery and the trade-in price was deducted from the SRP value of the new one.  Now my R2 is up and running again.  By the way for Motolite Express Delivery just dial 370-6686.