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New 12v Battery

175 views 7 replies 5 participants last post by  e-up!  
#1 ·
Hi, my eUp is now 5 years old and I had a message pop up saying the voltage was very low in the 12v battery. I checked this morning with a meter and it was just under 12v, so time for a new battery I guess.
Looking at the ones available online most seem to be 40ah or more whereas my old one is 36ah. I understood it was best to get an exact replacement to avoid reprogramming the car to the new battery?

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Does anyone know who stocks a 36ah battery suitable for a 2020 eUp?

Thanks
 
#4 ·
The superseding VW part number is 000915105DN, dimensions 175 (L) x 175 (W) x 190 (H). You're unlikely to find an aftermarket battery matching the exact 36 Ah, 300 A EN/SAE spec.

Excell EB440 is Exide's aftermarket equivalent (44 Ah, 400 A). I doubt there would be much jeopardy in installing that without programming it to the ECU. What is important is that the battery technology is the same, ie standard (lead-cadmium) flooded battery, not EFB or AGM). I would be surprised if the car doesn't self-adapt to the increased battery capacity over a few charging cycles anyway
 
#6 ·
VW's electrical workshop manual for the up! says that battery parameters need to be programmed on up!s equipped with stop-start systems, ie those fitted with EFB or AGM batteries. I don't have the electrical workshop manual for the e-up!, but I'm guessing that as these are standard flooded batteries, programming the replacement 12V battery parameters into the ECU is unnecessary
 
#7 ·
I am surprised your battery went like that. Do you do lots of short journeys with many 12v things on? I used to with my first E-Up and it was still okay but this one: several journeys each week totalling 80 to 110 miles. Most well over 15 minutes run time.
The 12v batt receives a charge (from the traction battery via the power & control unit - the big alloy box with the orange heavy duty cables) as soon as the key is turned to the first position. So any work it has to do is or should be covered by that. I was thinking that even a technically duff battery would be fine because it only needs the 'guts' to wake up the controller circuits. Mine is around 12v if i leave the bonnet open and wait till all has settled with the key out. Then it instantly goes up to 13+ volts with key in and 1st turn.
I bet the monitoring circuit is just one for all Ups and expects a battery to heave round and start an IC motor before receiving a charge. has anyone actually been stranded by an E-up with a 'duff' battery?