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i live in Ulaanbaatar the coldest city and i own a hyundai verna 2006 with 1.5 turbo diesel engine. i replaced it's 12 v 80 Ah battery and glow plugs about a 3 month ago. last night we had -40 c and in the morning i tried to start my car at -36 c. heated glow plug few times then cranked. after repeating cycle 5 times my battery gone out of juice. only if i had charge for 2 or 3 heat and crank attempts my engine must start. i felt it because every time when i crank engine was becoming more softer, crank speed was becoming faster and faster almost started. after that i thought if i had another 80 ah 12 v battery in my trunk it'll crank like a boss. is it possible to do this ? if yes . then how ? can this cars alternator fully charge these 2 total 160 ah batteries when engine is running ?

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    Have you tried using a battery heater rather than trying to fit another battery in the car? I've heard of them having good results, and I assume you are using a block heater all ready for your engine, right? – JPhi1618 Jan 22 '18 at 17:10
  • lots of similar questions on here, see this for starters : mechanics.stackexchange.com/questions/21026/… – Solar Mike Jan 22 '18 at 18:24
  • Starting a diesel in a cold climate is equivalent to performing a battery test with each cold start. – blacksmith37 Jan 22 '18 at 20:51
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Yes, this is possible.

What you need to consider is how you connect them.

1) connected directly with heavy starter cable - works and alternator will charge them both. Possible disadvantage is that if you leave the lights on then both become flat ie no security...

2) have a split charge system and a switchable connection to bring in the second battery to help starting - this is how I would do it (and have done it like this in the past).

A split charge system - usually found with motor homes etc

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