Ray is correct. You can disconnect the battery in your 458 without issues and it even shows you the correct procedure in the owners manual. BUT, there is a specific procedure for re-connecting the battery. This is also described in your owners manual, although you need to read the manual carefully to understand exactly how to do it because the procedure is described in a couple different sections.
Changing the battery on the 458 https://r.tapatalk.com/shareLink?share_fid=9080&share_tid=560727&url=https%3A%2F%2Fwww%2Eferrarichat%2Ecom%2Fforum%2Findex%2Ephp%3Fthreads%2FChanging-the-battery-on-the-458%2E560727%2F&share_type=thttps://r.tapatalk.com/shareLink?share_fid=9080&share_tid=560727&url=https%3A%2F%2Fwww%2Eferrarichat%2Ecom%2Fforum%2Findex%2Ephp%3Fthreads%2FChanging-the-battery-on-the-458%2E560727%2F&share_type=t See post #20. Sent from my iPhone using Tapatalk
We have discussed the lithium ion battery before ... price is rediculous highimo, compared to a normal battery ray ... And will it last longer than 2 years ?
Several times, for extended periods of time (i.e. months), like one does to an 80s/90s Ferrari with a cutoff switch and nothing happened? Kind regards, Nuno.
Correct. The car doesn't know how long it's off. As long as you follow the battery reconnect procedure in the manual, it shouldn't make any difference if the car is off for 5 minutes or 5 months. The capacitors in the ECU drain in 5 or 6 seconds - just like with any computer system. Ray
If I remember correctly, I believe the company (Braille) said the battery could realistically last up to 10 years or so on a street car (although don't quote me on that). I have a very similar design Lithium Ion battery on my motorcycle and it's going on 8.5 years with zero problems. And yes, they quite expensive... but can you really put a price on never having to use a battery tender? I don't think so Ray
They are pretty new on the scene, all right. However, if my motorcycle battery is any example, I'm guessing 5-8 years easy. This is similar to the lifespan of batteries used in the Tesla as well. The question here isn't how long a Lithium based battery will last. It's going to last however long the cells are capable of lasting. A better question is why a traditional battery - even one that is relatively new - is so prone to failing to start the 458 after only my a couple weeks of sitting, unless it's constantly attached to a battery tender. I think part of the answer is that Ltihuim batteries have lower static discharge rates than normal batteries. I drive my 458 about once a week, so the Braille I48CS works great and doesn't require any battery tender. Originally, I was going to use the I48CX (half the weight) but I opted for the CS model to gain more standby time. I'm planning to do some more work on my 458 soon here. One thing I was going to do was graph the voltage levels of the Braille battery as it sits in the car over a period of 10 days or so. I'll follow up when I do that. Ray
Do not close your car with key .The Alarm is in off Mode .3 month and battery ok i do this 3 years. But my car stand allways open and sleep without charger
Always learning. Thank you for your input, Ray! I've also been told leaving the car unlocked will reduce the parasitic power drain on the battery. Kind regards, Nuno.
I recently wired in a 500 amp DC shunt to the battery on my 458 and measured the parasitic current draw with both the alarm on vs. alarm off - the difference wasn't much as I remember. I don't have the specific readings, but I can maybe repeat the test and try to record it. It was also interesting to note that the current draw bounced around a bit as the car was sitting for a minute, which was a little unexpected. Around this time in my testing, I went to get my oscilloscope - and realized it had a cracked calibration knob. That was the end of parasitic current testing for the afternoon... When I get back to installing the kill switch on the 458, I'll see about taking some more readings. Ray
I am not sure why you installed a 500 amp shunt to measure the minute parasitic current. The values are likely to be much less than one amp. On my 360 I measured between 50 and 60 milliamps.
Originally I was going to leave it in the car permanently, so I could monitor power usage and battery condition all the time. This being the case, the shunt would have needed to be able to withstand the high amps drawn during starting the motor. For just measuring the parasite draw (when the car is off), something much smaller works fine. On the 458, I believe my readings were between 40 and 75 milliamperes - depending on the alarm being on or off. Also, the car seems to do something funny regarding leaving power on to the infotainment module at times also. Oddly, on my 360, I never had any problems relating to parasitic current draw. However, on the 458 it seems to be more of a concern. Ray
CTek do a remote battery monitor that works on Bluetooth, it is on their website. You leave it connected to the battery permanently. Not sure if that will be of use? Regards Michael
I've heard good things about the Ctek. I opted to buy the Braille battery charger and then I'll be splicing on the Ferrari 458 connector, so the car's ECU knows when it's charging, etc. So far I have never had to use the charger, but it's nice to know it's handy if needed. Ray
Speaking of the battery... I drove the car today, after having let it sit for about a week. Before I started it, I took a quick voltage reading. 13.22 volts after sitting unattended (alarm off) for about a week. Not bad. Car started right up. Ray Image Unavailable, Please Login Here is the voltage reading via the cigarette lighter w/ ignition on Image Unavailable, Please Login Here is the voltage reading according to the dash board - close enough
Hi Ray You could use one of these CTEK battery sense monitors with your Braille battery to monitor your voltage via Bluetooth save getting the meter out each time... http://www.ctek.com/products/vehicle/ctx-battery-sense Regards Michael
This is one of the best posts ever Ray I totally agree, never have to use a battery tender is really the option I would pay most for if there were such an option from factory
Looks cool. On the Braille battery, since it's Lithuim Ion, it does require a different charging method and voltage than a traditional battery. I'm not sure if the Ctek is fully compatible w/ the I48CS or not. I'd have to double check. The trickle charger I have is from Braille. There's also a very good thread on Ferrarichat showing how to wire up the actual Ferrari connector, which is something I'm planning on doing. I've already purchased all the fittings and tools to add the end to plug into the car; I'll post a thread about it soon. The Ctek charger does look pretty cool though. Ray
Guys, when I check my battery voltage in the morning, it shows 12.4 volts. Is that unusually low(for a 12 hour sleep?)? Its a 1 year old Interstate battery and I have been driving it regularly, but it sat at the dealership for 9 months. Probably ran low regularly.
That's fine. Here's a handy chart: Image Unavailable, Please Login Keep in mind that lithium cells have a different charge per cell, so that's probably why my battery is showing more than the voltage on the chart above. Ray
Rick, that is TOO low imo. Read all about changing (in my Yolo thread ?) ... and be prepared. Is a two hour job ... if you have the new battery and the simple tools. (Shown "red=oem" and "black is cheap" ) Image Unavailable, Please Login
I'd check to see where it is after 3 days and then a week, to get an idea of the discharge rate. Not sure at what level the car begins to have issues starting correctly. Ray
