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We started having the "service electrical system" message and yellow "bug" looking symbol on the display. Charging would cut off unexpectedly before the charge limit set on the juicebox was reached. I thought at first that the charging shutoff problem might have been due to the car being run hard in 100 degree heat with the A/C on and then pulling into the garage to charge without waiting (I like to wait a bit, but others in the family use the car too.)

None of the big chain autoparts stores can cross the battery on the 500e. My husband found that it is the same battery used in a Dodge Dart so we were sure it was a "normal" lead acid battery. Found a replacement at O'reilley auto parts by physically matching size. Same A/H rating too. They tested the battery at the store in and out of the car it showed bad. Manuf date of late 2014.

At rest the old battery read 12.6V and with the car plugged in read 14.2 ... so nothing out of the ordinary.

I hope this is the fix. We love the little car and have put 8000 miles on it since Jan 1, 2019. Purchased with 36000 miles on it.
 

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They tested the battery at the store in and out of the car it showed bad. Manuf date of late 2014.
I assume that's the old battery that was bad. Yes, batteries can occasionally show the proper voltage, but then fail a load test. A battery plate will break off. If it shorts internally, or completely breaks off, V will show low (or none). Sometimes it'll leave a small section of the cell attached. It might have enough amps to run a flashlight, but not a car's loads.

Great job on the cross-match.
 

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Replacing a 4-year-old 12V is pretty normal, for a gas car or EV. My buddy's 2014 500e needed 12V replacement last year. My own 2013 hasn't died yet, but I try to always open the hood when charging, & I try to avoid charging in the sun.
 

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The problem came back. We are getting the "service electric vehicle system" message and yellow dash light again. So, more problems. Will get code reader on it when I get a chance.
Please note that you cannot use an ordinary ODBII code reader on a Fiat 500e even though it's the same port. The only way to properly diagnose what's going on is to get a ELM327 style bluetooth scanner and connect it to a phone/tablet running AlfaOBD. Otherwise the standard ODBII codes while probing wreak havoc on the 500e.

ga2500ev
 

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I would suggest taking it to a FIAT dealer that knows what they are doing. My new to me 2015 500e was taken to a Dodge/Chrysler dealer by the prior owner and they read generic codes and thought my telematics module was bad. I have now taken it to a FIAT certified EV dealer and my entire HV battery needs to be replaced (free under warranty). 1hr of diagnostic time could save you a lot of hassle down the road.
 

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I figure my 2013 12V is on it's last legs, so I carry a little portable jump-starter, but thanks for reminding me: After nearly four years of zero running costs, I now keep forgetting that I need to budget the money for a new 12V.
 

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My 2015 500e is having the 12v battery final warning. My question is, how do you get the engine cover off to get to the battery?
 

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Ya, pull straight up. It takes quite some force, but it seems pretty hard to break. For some reason, (maybe because my hands have about the same spacing) I equate it to around the amount of force to lift a full laundry basket.
 

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I've tried this a couple times and backed off each time because it felt like I was pulling on something I shouldn't. It sure would be nice to see a video of somebody doing this.
I do understand the 12 v battery is under there. BTW, I've considered changing a li-ion battery for the lead-acid version that comes with with the car. But I'll start with just trying to get the cover off.
I've searched YouTube without luck. Anybody have one? Until I can see this done, I'm pretty leery about just yanking and pulling on something that doesn't seem to want to yield.
 

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2017 Fiat 500e (Billet Argento), 2015 VW Golf Sportwagen TSI 5MT (Tungsten Silver), 2002 Honda VFR
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Just yank on corners it will come off, if it breaks who cares you don’t need that cover anyway I leave mine off.
 

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So - I know this is dumb, but what the **** - you're talking about that big horizontal flat plastic piece with the dimples in it that says 500e against a white background, right?
I actually want to take it off so I can make sure I'm not drilling into anything important when I drill some holes in it. I want to attach a mesh holder on bungee cords that can hold my rat repeller so I don't have to remember to pull out the repeller every time I drive (see Scaring Away Rats).
Another alternative is velcro on a horizontal piece of plastic aft of this cover. But, sheepish as I am to admit it, I have yet to see a detailed under-the-hood diagram that will tell me exactly what I'm messing with. So, like I said, I'm kind of skittish at yanking on things I don't understand.
 

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2017 Fiat 500e (Billet Argento), 2015 VW Golf Sportwagen TSI 5MT (Tungsten Silver), 2002 Honda VFR
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Yes that cover sits on a little ball and there a rubber grommets on the cover that ball goes into. You just pull it up straight make it easier do it one corner at a time. You just yank up
 

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Well, thanks, but I still don't get it. Are the attachment points held in place by little rubber balls? There was direction here to just pull straight up. I tried that, and it felt like I was yanking at somebody's pancreas or something. The plastic itself feels flexible and like it ought to come off easier than it seems to want to. So I'm worried that I have hold of the wrong piece and will use my considerable might to yank out a vital piece of the car, which comes out trailing wires.
That could happen. If something is resisting me this hard, I have to stop and think. Is there a video?
 

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2017 Fiat 500e (Billet Argento), 2015 VW Golf Sportwagen TSI 5MT (Tungsten Silver), 2002 Honda VFR
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Haha nothing vital is attached to that cover it’s solely ornamental to cover the ugly guts underneath. It’s not like on a gas car where there is a piece of foam or insulation that suppresses mechanical or injector noises. The ball side is on the car side of the stands, the rubber grommets is on the cover they are replaceable if you lost it somehow broke one.
 
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