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Old 01-31-2019, 11:34 AM   #1
tmontague
 
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Lithium Ion Battery Jump Starters

I thought I'd post this as a heads up to those who have a lithium ion battery jump starter pack in their car for emergency use.

For xmas this past year my wife bought me a jump pack from Costco - The Type S jumper. I wanted one since I have a parasitic draw on my battery (~275-300mA) and if I let thre car sit for about 6 day in the summer or 2 days in the middle of winter, it doesn't have enough juice to turn over the car.

Well I fully charged the jumper and left it in my car in case I ever needed it. I needed it a couple week ago and went to use it and the jumper battery was almost completely dead. It had less voltage than my car battery so it automatically wouldn't jump the car. I took it inside and once it warmed up it read full charge. I ended up having to use my battery charger/75A jumper that I have and after 5 tries it finally turned the car over and started. 75A isn't as much as you think when it is -20C.

I have since kept my jumper in the house at night and if I think I may need it later in the day I bring it inside with me where ever I am. This morning my battery didn't have enough charge to turn over the engine and I pulled out my (room temperature) jumper. Hooked it up and the battery turned over like it was brand new and the car started.

Anyways, my point is, don't trust those lithium ion jumpers to do anything below 0C, during the winter bring them inside in case you actually need it. This is nothing new, Lithium ion batteries don't do well in cold, but something to keep in mind none the less.

I think my parasitic draw may be due to my aftermarket keyless entry but it is way too cold outside right now to test that theory.
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Old 01-31-2019, 11:48 AM   #2
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Thanks for the info. I have one and have not needed to use it yet in the cold. Only in warm. Good to know.
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Old 01-31-2019, 04:44 PM   #3
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Interesting info. One would expect that they will put some better batteries inside that pack (there must be something considering all those Teslas driving outside in minus temperatures).
I have bought myself solid jumpstart cables - in case I need them there is always a car around where I can beg for 5 minutes of their time. And I have really needed those cables once... when I was asked by a desperate colleague for help. :D
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Old 01-31-2019, 04:50 PM   #4
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Interesting info. One would expect that they will put some better batteries inside that pack (there must be something considering all those Teslas driving outside in minus temperatures).
I have bought myself solid jumpstart cables - in case I need them there is always a car around where I can beg for 5 minutes of their time. And I have really needed those cables once... when I was asked by a desperate colleague for help. :D
Google "tesla battery cold"

They have a ton of issues with cold weather. I believe tesla is even developing, maybe already offering battery warmers.
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Old 01-31-2019, 04:56 PM   #5
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Wouldn't that just consume more battery power? On an a battery that's already giving performance issues? Lol
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Old 01-31-2019, 05:19 PM   #6
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The preheating only works if the car is plugged in I believe.
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Old 01-31-2019, 05:32 PM   #7
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So if you're parked in a parking lot all day like say you were at work.... no bueno?
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Old 01-31-2019, 05:37 PM   #8
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So if you're parked in a parking lot all day like say you were at work.... no bueno?
Yep!
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Old 01-31-2019, 08:00 PM   #9
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It's a good idea to cycle the battery twice a month.

LiPo batteries swell if kept fully charged and unused for a prolonged period of time.

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Old 01-31-2019, 08:20 PM   #10
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The preheating only works if the car is plugged in I believe.
The real battery drain issue(when driving) is the heater/defroster. It's so bad you'll read of some Tesla owners just using mostly the seat heaters to reduce the load I still want one though, dammit
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Old 02-01-2019, 08:14 AM   #11
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Love the idea power and reliability of ev, but just not practical enough for me yet.
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Old 02-01-2019, 08:17 AM   #12
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Google "tesla battery cold"



They have a ton of issues with cold weather. I believe tesla is even developing, maybe already offering battery warmers.
I thought Tesla auto keeps the battery warm by itself?

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Old 02-01-2019, 08:19 AM   #13
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The preheating only works if the car is plugged in I believe.
You can warm the cabin remotely on a Tesla regardless. If it's plugged in, and not charging, it will use the battery to warm the cabin.

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Old 02-01-2019, 09:10 AM   #14
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Good to know. I don't know a whole lot about teslas, I have pretty much no interest in EVs
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Old 02-01-2019, 09:15 AM   #15
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Good to know. I don't know a whole lot about teslas, I have pretty much no interest in EVs
Well, you gonna have to change your mind. EV is gonna be the future, although I wish hydrogen fuel cells would have taken the lead. Burn hydrogen, exhaust water.

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Old 02-01-2019, 09:19 AM   #16
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Well, you gonna have to change your mind. EV is gonna be the future, although I wish hydrogen fuel cells would have taken the lead. Burn hydrogen, exhaust water.

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Nah, I'll find a way.
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Old 02-01-2019, 10:04 AM   #17
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Nah, I'll find a way.
Steam engine!

Ev may be the future, bit I don't think gasoline will die before my lifetime. Oil employs way too many people to have it disappear in 10 years. The economy couldn't handle it.
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Old 02-01-2019, 10:15 AM   #18
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the more EVs there are, the more combustion engine cars I'll buy and put straight pipes on.
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