Can a too large of an amp battery not fully charge in a car?

That's bull ****. Your alternator wil charge any battery wether it is a 300 CCA or a 1000 CCA. CCA (Cold cranking Amps) value is the amount of Amps that the battery can put out for a marging of 30 seconds. The CCA value has nothin to do with how the battery will charge but rather how much the battery can put out. Now, having a "too powerfull" battery for your car can be a disadvantage too. If your battery is way overkill, it will never get drained and recharged as much as a small battery would be (which may cause a weak battery down the road) personally, I like having a big battery in my car making sure it turns over at -40

i cant remember where, but i know i read it, but.....

''Replace battery with the biggest that will fit and the highest CCA you can afford''

i would demand another 720 amp or higher, if a store runs out of a product then its only good practice to offer the next item UP in quality.

and someone mentioned that the power top and windows could be a drain, i agree, to get a smaller battery is only making things worse when you know you have that load.

i would check your charging system b4 your warranty expires, so you dont have to buy a alt and a battery at the same time

im surprised the shop didnt check it, stores around here wont replace the battery until they check the charging system, to void the warranty and save themselves the cost of replacing a battery

Only if a large capacity battery were discharged relatively as deeply as a lesser capacity one, would the alternator take longer to recharge it. But if all is well with your car, day- to- day stopping and starting will only discharge any battery by the same amount, so recharging will also take the same time.

So long as the CCA rating is enough to cover you for winter cold starting and again, your car is not a problem to get running, having more capacity is futile.

Look up recommended CCA for your car and weather conditions. If the replacement battery is equal to or exceeding the recommendation, you have no case against the supplier other than you paid more (probably) for the larger capacity battery But then, it was you who made that decision!

No. You just can't go "down" in CCA from stock, that is a strain on the battery and a short life.

You need to drive any car on the freeway a few miles a week, anyway. All in-town won't fully charge anything.

How long did the 720 A/H last? You seem to go through a lot of batteries. Have your charging system load checked and starter draw checked. Is the belt tight?

Ever hear of what happening? some Dumb @$$ sales person trying to feed someone a load of crap?

Happens all the time. there's a reason their behind a parts counter making peanuts instead of being a mechanic and making good money. kinda like battery's, ya get what ya pay for. think of voltage as a river with barges on it, 12 in your case, and amperage as how much load each barge can carry, your charging system will load each barge till its full, your car uses as much of the load as it needs and the barge goes on its merry way down the currant to be topped off again by your charging system. so in other words your charging system doesn't care how big the barge is it will just keep loading it till its full. provided it is putting out the proper voltage, a lower amperage charging system will just load the barges slower that's all. now if you have some kind of outrageous sound system thats taking more amperage than the battery and charging system can put out your going to have some problems, get it?

Depends on your alternator output,low power alternators go in cars with low levles of electrical equipment.you don't say what youve got so I'd be guessing.

Stil,nearly 200 amps is a lot,I'd doubt your alternator could cope.

Anyway,two batteries in 5 months?your alternator sounds shot!

Good news is the guy clearly agrees the 720 is too much so your owed back the extra they charged you for supplying the wrong one in the first place!

That's a con job. Any car can use the highest capacity battery (amp hours and cold cranking amps) available for it. Maybe it's easiest to just use your current battery and never go back to that local dealer.

No ,IF the charging system works it may just take longer to reach full charge, 30 minutes instead of 20 Minutes.

No, Cranking amp rating has nothing to do with charging.

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You've [as you correctly surmised] been hosed. Do have your charging system checked or DIY if you know how.