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I think I have an idea about utilizing an AGM battery. The battery type, doesn't matter, as far as I would understand. But what does matter is the size in Amp Hours. The battery needs to have enough amp hours of energy storage that will allow the car to use an amount of power for accessories, to include the heater while being rejuvenated.
Things needing to know for minimal sizing is; what is the maximum draw for accessories and what is the recharge rate for the battery from alternator and traction battery.
Anyone have that information or any more information to offer concerning sizing the right AGM battery to install?
 

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I think I have an idea about utilizing an AGM battery. The battery type, doesn't matter, as far as I would understand. But what does matter is the size in Amp Hours. The battery needs to have enough amp hours of energy storage that will allow the car to use an amount of power for accessories, to include the heater while being rejuvenated.
Things needing to know for minimal sizing is; what is the maximum draw for accessories and what is the recharge rate for the battery from alternator and traction battery.
Anyone have that information or any more information to offer concerning sizing the right AGM battery to install?
Hello.
Did you figured it out which brand/auto store is good for new AGM battery?
 

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Seems like the AC Delco battery has been discontinued. Doing some digging same battery as used in 2013 up Chevrolet Spark. Based on research can possibly fit an H4. The bad news is no AGM from searching, the good news is just under $100 for a Champion H4 with 25% off special on Pep Boys .com
Screenshot_20200616-113619.jpg


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Thank you
Damn, no room for small car (and parts for them) here in America...
I was looking for this one (the one selected by Pepboy for 2014 fortwo)
63618

H4 and T4 batteries are different I am guessing? (nothing about the sizes on pepboy's website)
And do you believe it's ok to use that instead a OEM one? (double the price for the same kind of product...)
 

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I wouldn't worry about having a Smart battery. A battery is a battery and as far as I know there is no registration to be done. T4 is smaller than H4 from what I can gather:

machenry.com/documents/batteryspecs.pdf

I did find that LN1 is actually a size. Then found an AC Delco 88866037 on Summit Racing that looks like it would ship today meaning still available. Sorry I didn't see that until a few minutes ago...

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I asked on another threat also and somebody find the same brand (ACDelco) than you are telling me, no the same reference though
 

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What are the surge (amps) requirements for the ED? I bought a 52ah LiFePO4 battery a year ago that has dinky screw terminals, no big deal really, unless for some weird reason the ED has momentary surge requirements. Main reason I haven't used the lithium batt yet is that the original 12v refuses to die as it appreciates the extraordinary care it has been receiving lately. My plan: leave the lead-acid in place, trickle-charge it at every oportunity and then hook up extender cables for the (lightweight) lithium batt which will test run the car. Then the lithium can easily be removed for security (since it cost $550-US) or for sub-freezing weather. Having two 12v batts in the car = best of both worlds. 8^)
--
 

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EV's don't have any surge requirements as all the battery is doing is to power up the HV system and
power all the 12V equipment. I don't know anyone else locally using a Lithium 12V to power a smart car however,
a friend of mine who has a 2014 Nissan Leaf has been using 40ah LiFePO4 battery for three years with
no problems whatsoever. One of the recommended Lithium replacements for a Tesla Model S is only 30 ah!
 

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I have a Lithium battery in our Prius v. Coming up on 2 years so far so good. It even has a backup function if the main cell is drained.

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Hmm. I was digging through the '15 ED manual because someone was concerned about possible slow HV charge rate. The instructions on how to remove and replace the 12 V is in the Owners manual and there is zero mention of removing the service disconnect. There is warning not to leave the HV battery depleted or nearly completely depleted for 14 days or longer or it can be damaged. It also advises against letting it drop below 20% charge before recharging, nor charging at 80% or above...

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"instructions on how to remove and replace the 12 V is in the Owners manual " I'm looking but can't find it, when you get a moment, please page or section info?
 

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Hi,

Went to find it lest I was dreaming:


Choose

2015

electric drive

OWNER'S MANUAL (2.8 MB)

pp 198-200

If it's the same as Mercedes 6Nm on the terminal nuts. (Sorry I didn't subscribe to startekinfo yet).

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Hmm. I was digging through the '15 ED manual because someone was concerned about possible slow HV charge rate. The instructions on how to remove and replace the 12 V is in the Owners manual and there is zero mention of removing the service disconnect. There is warning not to leave the HV battery depleted or nearly completely depleted for 14 days or longer or it can be damaged. It also advises against letting it drop below 20% charge before recharging, nor charging at 80% or above...
In the German manual there is a clear statement to pull the service disconnect if you working on the 12V system as otherwise the stored disappearing charge on the 12V network could lead to switch on the contactors of the HV to activate the DCDC converter to charge the disconnected 12 battery. The central gateway controller CEPC is commanding if the KL30 is below 10.5 V to the HV Battery switch on the contactors and dc/dc converter.
This is also the reason for the discharging of the HV Battery if the 12V Battery is broken or get empty.
 

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Thank you. That's frustrating there is conflicting instructions. That is for a C451 ED and not C453 I assume?

I guess the order of operations should be:

1. Verify HV battery has above 20% charge
2. Pull HV disconnect if possible
3. Pull the neg terminal clamp.
4. Pull pos terminal clamp.
5. Disconnect drain/Remove hold down and replace battery
6. Connect pos terminal
7. Connect neg terminal
8. Reconnect HV safety disconnect.
9. Secure hold down and reconnect drain.



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2017 453 Passion ED/EQ
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"That is for a C451 ED and not C453 I assume?"

Ahhhhh, investigating this comment opens an interesting can of worms.

On p 23 of the 2018 453 EQ manual found online,:
"Always have the following work carried out on your vehicle at a smart center:
  • work relevant to safety
  • service and maintenance work
  • repair work
  • alterations, installation work and modifications
  • work on electronic components
  • replacing the 12 V battery within the prescribed interval, at the latest every three years.
You can obtain up-to-date information concerning the servicing of your vehicle at any time from a qualified specialist workshop,e.g. a smart center."

So they obviously don't want you messing with the 12 v battery yourself.

However, the printed 2017 453 Electric Drive manual, which, curiously, is not available online, does not have that 12 v battery line in the same section on page 23. It was added in 2018. :unsure:
 

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OK, think I just found out why Smart doesn't want DIY'ers to change the battery, the opening to pull the battery out of a 453 is only 5.5 in wide. Either it needs to be dropped out from below, or half of the windshield border or the cooling fan assy needs to be removed first. Either way, I'd never attempt without some guidance from experts first.
64661
 

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"That is for a C451 ED and not C453 I assume?"

Ahhhhh, investigating this comment opens an interesting can of worms.

On p 23 of the 2018 453 EQ manual found online,:
"Always have the following work carried out on your vehicle at a smart center:
  • work relevant to safety
  • service and maintenance work
  • repair work
  • alterations, installation work and modifications
  • work on electronic components
  • replacing the 12 V battery within the prescribed interval, at the latest every three years.
You can obtain up-to-date information concerning the servicing of your vehicle at any time from a qualified specialist workshop,e.g. a smart center."

So they obviously don't want you messing with the 12 v battery yourself.

However, the printed 2017 453 Electric Drive manual, which, curiously, is not available online, does not have that 12 v battery line in the same section on page 23. It was added in 2018. :unsure:
Well, they don't want you doing and maintenance work or "repair work" yourself either. In other words, they don't want you to do anything. This is jsut lawyers and the marketing division talking.
 
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