Absolutely agree, My car often sits for a couple weeks at a time and I've also never had a starting problem. One thing you could try is to turn off both bluetooth and wi-fi in the settings and see if that makes a difference. Long shot I know. Dealerships may be reluctant to do any kind of investigation if the car is under warranty if they don't think Honda will cover a fishing expedition.

 

Ok, lets go through the issues that the service department told us that was causing or might cause the issue and they HAD to check before they would replace the battery, and mind you I have gone through this SEVEN times to date.....A major cause of dead battery in Honda Fit is degradation due to old age. And the first time was on the 2015 Fit I went to start it late one night, and the lights came on but no start and jump start made it think it started but just sat there so got AAA flatbed in morning to take me to dealer, and the battery was about 20 months so didnt think much about the service department saying it may have been a older battery or the car sat for a while before being sold to me, so they replaced at no charge as under car warranty.

Then when I came back with the same 2015 Fit they said it probably was the alternator and drained out the NEW battery quickly as it is no longer getting charged by the alternator. Well they ran it through every test they could think off and found nothing and replace the battery without telling me why it died, but charged me as they said no longer under warranty even though it was a NEW battery as they said it had to be under the CAR warranty, but the starter would not turn over, but I had a extended warranty on the 2015 so they replaced the starter, no charge..

Then my new 2016 Fit went dead as a doorknell one morning and they said I must have left a door open or light on, which I knew was not possible as I check that since the issues with the 2015. So they said it was a parasitic draw but they checked everything on it and nothing came up and since under warranty they replaced the battery no charge.

So the NEW battery on the 2016 Fit went dead after 6 months and they said I must have left it sitting for too long or the battery was defective and they replaced it no charge as still under car warranty, by a few days. So got my trickle charger out and put it on them if the cars sat for any period of time as no more car warranty.

Then the 2015 Fit went dead as a doorknell and I was in Texas on the NEW battery I had bought, so drove to dealer on spare DIEHARD I carry now and dealer checked everything and found nothing and put a NEW battery, no charge

Then the 2016 went dead with no car warranty, and had AAA give me a FULL charge jump and get to dealer, so they said it must be loose electrical connection, a damaged wire, or corrosion on the battery terminals. But they checked it and everything was like new as I keep them pretty clean and battery bad so they replaced the battery at no charge without saying anything.

So now the 2015 dies stone dead in Texas on the NEW battery with 12 months, and I bring it back on the DIEHARD to the dealer there and they go over everything but checked out ok. They said they would have to charge me a prorated rate on the NEW battery because they already replaced it. My wife didnt tell me till we were already on the way to Florida, so my bad.

Now on either of the Fits, it is NOT hard to start, and does NOT have a slow crank, and it does NOT makes clicking noise when you try to start the engine, the lights will go on but cannot jump it as it thinks its on with no turnover. Sometimes AAA can give it a quick charge and it gets me to the dealer but always has dead cells when dealer checks. Its not parasitic drain, or bad alternator, or loose battery connection, or poor ground connection. And can the battery with an external charger but when they test the battery at the dealer they say its defective or has dead cells, not sure if any difference as same end result, no start and wont jump even with trickle charge overnight or jump cables from another car/truck unless AAA uses gives it a quick FULL charge and that just is to get to the dealer as I dont trust it after that. But dealer always checks the batteries and declares them needing to be replaced no matter. They are maintained, and had all recommended services by dealer only and are not driven hard or abused, or driven other than normal use with under 10,000 miles a year.

 

By any chance are you leaving a key fob near the car? A Honda dealer told a friend that's why her Civic wouldn't start, although that didn't turn out to be the case.

And- do you have ANYTHING after-market on the car?

 

My battery went a few months ago. It would take a charge but it was weak. I charged it up, went to Napa and got their OEM replacement. Weak batteries are hard on the rest of the electrical system, particularly the alternator, so now my plans are to replace it every three years. Then I don't have to worry. Didn't want to mess with modifying the battery tray, so I didn't go for bigger battery, but that certainly is a viable option.

 

Totally agree!
This might seem like a waste, but when you consider the cost and inconvenience of waiting for a tow truck etc, it's pretty reasonable.

 

The Fobs are always put away far from the car inside the house, and I didn't put anything as they were under warranty but that is dropping out so thinking of changing the push start to a key on both. I think that has some kind of parasitic drain or the security, but dealers can't find anything or not admitting there is a issue with either one.