80ah instead of 90ah Battery any dangers!?

Beeman · 10-11-2018, 12:06 PM

Hi guys sorry if this sounds naive but thought I get expert advice from you guys ok so am replacing the battery in my F30 320d ED it had a 90ah battery but I have just ordered an 80AH battery albeit with the same voltage and size would it be a problem !?

Thanks for your replies

IK6SPEED · 10-11-2018, 12:59 PM

Quote:

Originally Posted by Beeman

Hi guys sorry if this sounds naive but thought I get expert advice from you guys ok so am replacing the battery in my F30 320d ED it had a 90ah battery but I have just ordered an 80AH battery albeit with the same voltage and size would it be a problem !?

Thanks for your replies

If it had a 90ah battery it should be replaced with a 90ah battery.

anotheran · 10-11-2018, 01:05 PM

make sure you have your car coded and registered for the 80AH battery otherwise the car may over charge the battery.

upsidedownfunnel · 10-11-2018, 01:18 PM

Yeah you should use a 90Ah battery. If you absolutely don't want to, make sure to code it for the new battery capacity in ADDITION to registering it. If you simply do a battery registration, it will assume the new battery has the same capacity as the old one.

bimmer456 · 10-11-2018, 02:40 PM

90 AH is needed for auto start stop. You can get them pretty cheap if you code and register it yourself.

BEAR-AvHistory · 10-11-2018, 03:53 PM

No but it needs to be registered (coded). Car is coded to charge for 90 amps. IIRC you can code for 70-80-90 batteries.

1QuikWS6 · 10-11-2018, 04:13 PM

Rule of thumb - never replace a battery with one of lower capacity.

Your car came with 90ah for a reason...

Beeman · 10-11-2018, 04:31 PM

Thanks guys really appreciated the only reason was that the 90AH is being sold for £320 and the 80AH is £174 so massive difference 😢😢

bimmer456 · 10-11-2018, 05:33 PM

Quote:

Originally Posted by Beeman

Thanks guys really appreciated the only reason was that the 90AH is being sold for £320 and the 80AH is £174 so massive difference 😢😢

There might be non oem batteries rated for 90 ah. We have those in the states much cheaper.

IK6SPEED · 10-11-2018, 06:17 PM

Quote:

Originally Posted by Beeman

Thanks guys really appreciated the only reason was that the 90AH is being sold for £320 and the 80AH is £174 so massive difference ��

And a 1 series is cheaper than a 3 series.

Regular gas is cheaper than premium.

A Volkswagen is cheaper than a BMW.

Your point?

Beeman · 10-11-2018, 06:47 PM

Quote:

Originally Posted by IK6SPEED

Quote:

Originally Posted by Beeman

Thanks guys really appreciated the only reason was that the 90AH is being sold for £320 and the 80AH is £174 so massive difference ��

And a 1 series is cheaper than a 3 series.

Regular gas is cheaper than premium.

A Volkswagen is cheaper than a BMW.

Your point?

Point being for 10AH more am paying almost twice the amount which from my understanding what matters is the voltage of the battery remain the same in this case 12v and the size for fit...

BEAR-AvHistory · 10-11-2018, 07:24 PM

Quote:

Originally Posted by Beeman

Point being for 10AH more am paying almost twice the amount which from my understanding what matters is the voltage of the battery remain the same in this case 12v and the size for fit...

With that money spread would buy a 80 amp on the input side. Have an 80 amp as a replacement in my 135is.

You want to maintain or exceed the factory specs on the discharge sides CCA, CA & reserve capacity ratings

IK6SPEED · 10-11-2018, 07:35 PM

Quote:

Originally Posted by Beeman

Point being for 10AH more am paying almost twice the amount which from my understanding what matters is the voltage of the battery remain the same in this case 12v and the size for fit...

You clearly do not understand amperage.

Wattage is only one part of the equation.

You can use 8 D size batteries in Series and get 12VDC for about 10£ using your logic.

Or save space and use a single 9 volt and 2 D batteries for 5£

1QuikWS6 · 10-12-2018, 05:06 AM

The AH rating means:

AH = Amperes per hour(Amperage), a 90Ah battery means that your battery can last for 1 hour by giving 90A continuously,

This is in a perfect world with battery @ 100% charge to begin with, normal state of charge in real life of a battery installed in car might be around 70–75% = less than 1 hr in real life

With all the electronic systems pulling off the battery in new cars it's best to go with highest AH available for your specific car - again, that's the reason the 90ah battery was installed from the factory

I get it that the other may be cheaper, but you should have guessed that owning a BMW was not gonna be cheap from the start

And yes, there are aftermarket batteries available with 90ah rating that would be cheaper so that's an option

Did your pricing include new battery, installation, & registering? Here in U.S. I was quoted $700 for all included in my old E92, I'm not gonna pay that price for a battery, so I purchased a new OEM BMW battery of correct ratings, installed it myself, & registered it with Carly app/dongle

> Even if you install a battery of same rating it should be Registered so that the charging logic car uses is correct - this can be done DIY using Carly or Bimmercode

>If the new battery is a different ah than factory also = Coding different ah is necessary + Registering upon install

10-11-2018, 12:06 PM	#1
Beeman New Member 6 Rep 17 Posts Drives: BMW 320d ED Join Date: Sep 2018 Location: London iTrader: (0)	80ah instead of 90ah Battery any dangers!? Hi guys sorry if this sounds naive but thought I get expert advice from you guys ok so am replacing the battery in my F30 320d ED it had a 90ah battery but I have just ordered an 80AH battery albeit with the same voltage and size would it be a problem !? Thanks for your replies
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10-11-2018, 01:05 PM	#3
anotheran Sedan Driver 389 Rep 1,018 Posts Drives: A nice car Join Date: May 2016 Location: Canada iTrader: (0)	make sure you have your car coded and registered for the 80AH battery otherwise the car may over charge the battery. __________________ Slapping on M Performance parts, ZHP, badges, and stickers does not ///M car make ZCP \| ZHP \| ZTR \| ZE0 \| MSport \| ZMP \| DHP \| MStickerPack \| THP \| MPPSK \| MPPK BMW MSP Lightweight Jacket \| DTM Motorsport Team Cap\| BMW M Drift Cat 5 \| BMW M Thermo Mug
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10-11-2018, 01:18 PM	#4
upsidedownfunnel Colonel 1996 Rep 2,499 Posts Drives: 2014 335i Join Date: Jul 2017 Location: SoCal iTrader: (4) Garage List 2014 BMW 335i [0.00]	Yeah you should use a 90Ah battery. If you absolutely don't want to, make sure to code it for the new battery capacity in ADDITION to registering it. If you simply do a battery registration, it will assume the new battery has the same capacity as the old one.
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10-11-2018, 02:40 PM	#5
bimmer456 Major General 2950 Rep 5,984 Posts Drives: 340i Join Date: Nov 2016 Location: Pasadena, CA iTrader: (0)	90 AH is needed for auto start stop. You can get them pretty cheap if you code and register it yourself.
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10-11-2018, 03:53 PM	#6
BEAR-AvHistory 2020 Z4 M40i - 2022 M4C Convt 3124 Rep 5,264 Posts Drives: 2020 Z4 M40i - 2022 M4C Convrt Join Date: Jun 2011 Location: Raleigh, NC - OIB, NC iTrader: (0) Garage List 1965 COBRA (FFR rep ... [8.57] 2023 Jeep Wrangler ... [9.50] 2009 Yamaha V-Star [0.00] Cars 2-BMW, 2-FORD, ... [0.00] 2023 Ford Expeditio ... [0.00] 2020 Z4 M40i [10.00] 2022 BMW M4C [7.25] 1998 FORD Ranger 4X4 [0.00]	No but it needs to be registered (coded). Car is coded to charge for 90 amps. IIRC you can code for 70-80-90 batteries. __________________ Kevin Dravit Gray, Black Leather, Moonlight Roof, Red Calipers 2022 M4C - 2020 Z4 M40i - 2023 FORD Expedition XLT Max 4X4 400BHP - 2009 V-Star - 1998 Ranger 4X4 5MT - 1965 Cobra (R) 5MT - 2023 Jeep Wrangler Sport S 6MT
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10-11-2018, 04:13 PM	#7
1QuikWS6 No 55mph 1619 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	Rule of thumb - never replace a battery with one of lower capacity. Your car came with 90ah for a reason... __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit
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10-11-2018, 04:31 PM	#8
Beeman New Member 6 Rep 17 Posts Drives: BMW 320d ED Join Date: Sep 2018 Location: London iTrader: (0)	Thanks guys really appreciated the only reason was that the 90AH is being sold for £320 and the 80AH is £174 so massive difference 😢😢
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10-12-2018, 05:06 AM	#14
1QuikWS6 No 55mph 1619 Rep 8,476 Posts Drives: F32 435ix MSport Join Date: Jul 2009 Location: Blitzburgh, PA iTrader: (113) Garage List 2022 BMW M440ix Vert [0.00] 2015 BMW 435ix MSport [0.00] 2000 Pontiac Trans Am [0.00]	The AH rating means: AH = Amperes per hour(Amperage), a 90Ah battery means that your battery can last for 1 hour by giving 90A continuously, This is in a perfect world with battery @ 100% charge to begin with, normal state of charge in real life of a battery installed in car might be around 70–75% = less than 1 hr in real life With all the electronic systems pulling off the battery in new cars it's best to go with highest AH available for your specific car - again, that's the reason the 90ah battery was installed from the factory I get it that the other may be cheaper, but you should have guessed that owning a BMW was not gonna be cheap from the start And yes, there are aftermarket batteries available with 90ah rating that would be cheaper so that's an option Did your pricing include new battery, installation, & registering? Here in U.S. I was quoted $700 for all included in my old E92, I'm not gonna pay that price for a battery, so I purchased a new OEM BMW battery of correct ratings, installed it myself, & registered it with Carly app/dongle > Even if you install a battery of same rating it should be Registered so that the charging logic car uses is correct - this can be done DIY using Carly or Bimmercode >If the new battery is a different ah than factory also = Coding different ah is necessary + Registering upon install __________________ F32 435ix//MGM//M Sport-Prem-Tech-Driver Assist-Lighting-Cold Weather-Dyn Handling Pkgs//M4 Black Lthr Int w/M4 Alum Blade Trim//HK w/Bavsound Stg3//763M//M4 Euro LCI Tails//M4 Mirrors w/CF Covers//AWCarbon CF F/R Spoilers-Side Splitters-Diffuser 6WB/ID6 HU+HUD/IND M4 Alcantara Armrest//PURE S2 Turbo//AA FMIC+DP//ER CP+TIC//3.5bar TMAP/TS DV//AWE Tuning Exh w/Blk Tips//Turner MS CF Intake//BM3 Cary Jordan Tune//MPerf Diff//PrecRW Ignition Kit Last edited by 1QuikWS6; 10-12-2018 at 05:19 AM..
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