This is one of the best suggestions that can be made for a Spark EV - charging the 12 volt AGM battery monthly. I use a BatteryMINDer model 2012-AGM charger. To make things easy, I mounted the charger on my garage wall and use a long extension cable so I can go clear across my garage. I also bought the adapter that lets me charge through the OBD2 port inside the car. It works great! Almost every month, I charge the battery in each car for about 12 - 15 hours. This charger is specifically for AGM batteries and it has a desulfating function too. I have not had any 12 volt battery problems. I purchased my 2014 as a used vehicle in August of 2015 and replaced the 12 volt battery as a precaution. That battery is still in the car. My 2016 - which I also purchased as a used vehicle - still has the original factory-installed 12 volt battery.SparkE wrote: ↑Sat Jan 02, 2021 7:56 pmJust FYI : I highly recommend getting a smart trickle charger for your 12V accessory battery and charging overnight once a month.
Here's a post that (somewhat) discusses the issue (there are others) :
https://www.mychevysparkev.com/forum/vi ... =20#p26886
Good suggestions regarding the power banks. I never have tried to start either of my Spark EVs with the power pack and, fortunately, I have never had the need to do so. Every month I put each Spark EV on the 12 volt AGM charger for about 20 hours and, so far, I have not had any 12 volt battery problems.SparkE wrote: ↑Wed Jan 06, 2021 8:00 pm.
DrMorgan : I highly suggest NOT leaving your emergency "jump starter" pack in your car in the summer in the central valley. The heat will not do good things for the life of the pack. During the summer (even though I live in the SF Bay Area) I keep the jumpstarter in a little bag that I grab when I leave the house. I know not to forget it because I put my Spark keys *inside* the bag when I get home.
I would also recommend a de-charge and re-charge about once every 4-6 months. Maybe charge all your portable devices (phones, laptop computer, mobile phone battery banks, etc) to drain the battery down a little bit, then recharge the jumper. It's as much a way to remember to check that the battery pack has a charge as a battery health thing.
Oh, have you ever dis-connected the battery and tried to run your Spark off the jumper?