Vishnu -
I had a similar experience. My March 2013 Santro Xing, which was not a daily driver, but a weekend-only driver, say for 10-20 kms a week, and of course my highway cruiser, thus having done 33k on Odo in 5 years 10 months as on 26th Jan 2019, a Saturday when the battery had died.
I will explain.
I am sure I never had issues with the battery, though the car would be cranked / run / used only once a week, and very rarely twice or thrice a week (Remember I am taking about stock battery from Hyundai, the Amaron - white color).
4-5 months ago, I started experiencing a small lag, say for 1 to 2 seconds in cranking. But this didn't happen on every crank. I would say 2 times out of every 10 times I cranked / started the engine. I got it checked from a local battery shop guy here in Avadi, who inspected and said the battery is in shape, charge is not an issue, acids and water levels are up to the mark, however, the cell plates have started corroding, and he advised me to be on the safer side by replacing battery ASAP.
I managed running, since very occasionally I had this cranking lag, and not every time.
26th January 2019 Saturday - We had well planned to visit our honourable Divine, Dhanwanthri Temple, near Ranipet / Walaja. We packed our breakfast, and lunch, came to my parking for loading the car.
My shock - my remote key failed to unlock the car, and this was unusual. I was stunned, and slowly I started realising the culprit. The indicator light in the remote key was not glowing at all, which again was unusual. I manualy opened the car with key, and inserted the key and twisted.
Voila - no dashboard lights, no response. I confirmed that the battery had run out of charge.
I called by neighbouring battery dealer for Amaron. He was a nice person, and offered a service battery once I said I had planned for a temple trip. 15 minutes, and the battery guy came with spare, and started the car with the service battery. He checked all possible faults and couldn't find any fault.
He said he'll try to charge my battery and try to have it rectified, even though the hope was very less.
And to cut a long story to short, the battery was dead, and two of the cell plates had conked off, and hence the battery had to be replaced. Replaced with a new Amaron FLO 48 months warranty battery, and had to cough out Rs. 4,100.00 totally.
Cost of the battery : Rs. 4716, less my battery taken for Rs. 750.00, plus Rs. 150.00 for the service battery I had used for the temple trip.
And trust me the temple trip ended very pleasant with the service battery.
5 years 10 months, and around 34000 kms should ideally be a good life out of a stock battery, which as per the technician, has an average life of 18 months - 24 months only, since car manufacturers contract the battery manufacturers and procure for very less cost, ending up in procuring very less reliable battery with not so good quality, and that has given such a good life. So I believe my new battery would live for around 8 years, or till life of the car
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