nskio
New member
- Location
- North Carolina
- Car(s)
- 2018 Golf R
Hey guys, have a 2018 Golf R, but this is a battery question and I believe it's the same across the GTI/R.
Went to start the car recently and barely cranks, think my toddler left on the map lights (I thought the car actually would turn these off if left off, but guessing not). I was in a rush and wasn't able to charge it, left it sitting in the driveway for ~3 days and got it on a charger that came from amazon. Charger would "run" for a couple hours and then flip over to a trickle, despite the voltage reading 10.75V across the terminals. Try to start it and it won't even crank. If I use the boost feature followed by the 75A starter, after a few rounds of boost I'm able to barely get it to start. Took it for a 30 minute drive or so, get back and it's still dead.
At this point I'm pretty convinced this battery is fubar. My plan is to simply get a new battery and clear the faults, but please let me know if something else is amiss. A few q's as I try to understand, since this is my first time dealing with a battery problem like this...
* Could someone sanity check that for me? Would letting the OEM stock battery (the 6R0915105B), drop low enough actually end up killing the battery?
* Want to replace it myself, but reading a lot about how the new battery needs to be "dialed in" to the ECU. I have an OBDEleven, so I'm fairly sure this is pretty simple. My understanding is, I have two options. I can order an identical OEM battery from VW, in which case I can just update the serial number to tell the ECU it's a new battery, OR I can get an aftermarket AGM battery like this (https://www.autozone.com/batteries-...gm-group-size-48-760-cca/319460_1574355_25698), and not only update the serial number, but also set some other configuration? Can someone confirm this, and also elucidate on exactly what I need to configure?
* Does a new battery come charged, or should I leave it on my charger overnight before installing?
* I've read something about a "battery saver", so between removing the original battery and the new battery, the power doesn't drop to literal zero and volatile memory is wiped. Is this a concern, or am I good to just swap?
* Will dropping to this low of a charge actually hurt other subsystems in the car, or will trying to start it without sufficient power mess anything up? Concerned that I could have damaged something else at this point.
Thank you SO much. Worried about this thing and sucks not having it ready to go :/
Went to start the car recently and barely cranks, think my toddler left on the map lights (I thought the car actually would turn these off if left off, but guessing not). I was in a rush and wasn't able to charge it, left it sitting in the driveway for ~3 days and got it on a charger that came from amazon. Charger would "run" for a couple hours and then flip over to a trickle, despite the voltage reading 10.75V across the terminals. Try to start it and it won't even crank. If I use the boost feature followed by the 75A starter, after a few rounds of boost I'm able to barely get it to start. Took it for a 30 minute drive or so, get back and it's still dead.
At this point I'm pretty convinced this battery is fubar. My plan is to simply get a new battery and clear the faults, but please let me know if something else is amiss. A few q's as I try to understand, since this is my first time dealing with a battery problem like this...
* Could someone sanity check that for me? Would letting the OEM stock battery (the 6R0915105B), drop low enough actually end up killing the battery?
* Want to replace it myself, but reading a lot about how the new battery needs to be "dialed in" to the ECU. I have an OBDEleven, so I'm fairly sure this is pretty simple. My understanding is, I have two options. I can order an identical OEM battery from VW, in which case I can just update the serial number to tell the ECU it's a new battery, OR I can get an aftermarket AGM battery like this (https://www.autozone.com/batteries-...gm-group-size-48-760-cca/319460_1574355_25698), and not only update the serial number, but also set some other configuration? Can someone confirm this, and also elucidate on exactly what I need to configure?
* Does a new battery come charged, or should I leave it on my charger overnight before installing?
* I've read something about a "battery saver", so between removing the original battery and the new battery, the power doesn't drop to literal zero and volatile memory is wiped. Is this a concern, or am I good to just swap?
* Will dropping to this low of a charge actually hurt other subsystems in the car, or will trying to start it without sufficient power mess anything up? Concerned that I could have damaged something else at this point.
Thank you SO much. Worried about this thing and sucks not having it ready to go :/
