Read this warning to prevent hv battery failure!! - Smart Car Forums
User Tag List

LinkBack Thread Tools Display Modes
post #1 of 2 (permalink) Old 06-12-2019, 09:16 PM Thread Starter
Join Date: Mar 2015
Location: Pittsburgh, USA
Posts: 914
Thanks: 10
Thanked 99 Times in 85 Posts
Mentioned: 3 Post(s)
Tagged: 0 Thread(s)
Quoted: 352 Post(s)
Read this warning to prevent hv battery failure!!

This forum has accumulated enough case studies of high voltage (HV) battery failure if the 12V battery is left dead for more than several days that the following warning is now warranted!

1. Through a defect or design feature in the Smart ED that is not entirely clear, it is now almost certain that if the 12V battery is removed or becomes discharged, and is allowed to stay discharged or removed from the vehicle for an uncertain period of time (on the order of several days to a month) the HV battery will also then totally discharge itself over an unknown time period (probably several days) and be ruined - resulting in a likely total write-off of the car.

2. To prevent this from happening, any Smart ED owner who plans on not operating their ED for 2 weeks or more MUST connect a maintenance charger to the car's 12V battery and double-check the charger's proper operation. IMPORTANT NOTE: Keeping the car connected to a charging station or the car's wall socket charging adapter is NOT, repeat NOT a substitute for this measure. It will NOT keep the 12V battery charged!

3. Consider running a pair of charging wires (16 gauge or so) from the 12V battery terminals to an appropriate location under the service flap for easy 12V battery charging.

4. Connecting the car to charging station is only needed of the car will be subject to temperatures lower than -20C (-4F) or above 40C (104F) otherwise, it is best to store the car with the HV pack at an indicated state of charge of 80 percent. But ALWAYS keep a 12V charger connected to the 12V battery.

Last edited by Yinzer; 06-13-2019 at 06:35 PM.
Yinzer is offline  
The Following 5 Users Say Thank You to Yinzer For This Useful Post:
Jebcidic (06-13-2019), magilly00 (06-13-2019), RickyM (Yesterday), Smart Bob (06-13-2019), sokoloff (06-14-2019)
Sponsored Links
post #2 of 2 (permalink) Old 06-16-2019, 01:38 PM
sokoloff's Avatar
Join Date: Aug 2013
Location: Ocean Isle Beach, NC
Posts: 1,102
Thanks: 72
Thanked 155 Times in 119 Posts
Mentioned: 7 Post(s)
Tagged: 0 Thread(s)
Quoted: 319 Post(s)
This info thanks to forum member MB DNA:

As pre-owned ED's can often be dead stock (lot inventory) "stored" in the elements (cold) with no electricity nearby, 12V & HV battery conditions may be suspect?

ED should be able to move under it's own power without a "jump start" and the first new owner maintenance action item should include checking the 12V battery age/condition.

This is especially true of ED's bought at auction that are now in the hands of dealers who may be unfamiliar with EV's and their nuances.
sokoloff is offline  
Closed Thread

Quick Reply

Register Now

In order to be able to post messages on the Smart Car Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome

Clubs, Garage Plus vBulletin Plugins by Drive Thru Online, Inc.