How to accurately measure the voltage of the batteries on BMW Z4?

To measure the battery voltage accurately, the top charge must be removed. Achieving this involves switching on the higher lights for a period of ten seconds and then turning them off to allow the vehicle stay for about two minutes. Battery check begins by taking off the battery cover and unplugging both the negative and positive battery cables. The indicator eye at the top of the battery should be visually examined; it has to be black meaning that it should be charged if yellow or replaced in case of defects. Open circuit voltage is measured using a digital voltmeter, which should give about 12.6 volts for a fully charged battery. Charge your battery first if it is less than this value before you proceed with other steps. A load tester is next used to carry out a load test on your battery. Connect this device to your terminals, apply its load within fifteen seconds without letting your cells' voltage drop below 9.6 volts. When it is weak or defective, an indication will appear in a load tester's display window. During replacement of one's battery, check with dealer parts department or auto parts store that sells batteries so as to get accurate choice of battery required in such cases. Remove relevant trim panels and also loosen up the positive plus negative cables connected to my battery Remove relevant trim panels and also loosen up the positive plus negative cables connected to my batter Ensure that there is no corrosion beneath your cells after lifting them out carefully as they are heavy Avoid being careful when lifting out my cell due to its weight; look at underneath if corroded clean It should first connect new batteries and lastly attach negatives.

Genuine BMW Z4 Batteries

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18 Batteries found

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BMW Z4 BATTERY
Part Number: 84106833994
$75.75 MSRP: $101.98
You Save: $26.23 (26%)
Ships in 1-3 Business Days
ADD TO CART
Product Specifications
- Other Name: Accumulator
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW Z4 | M40i(G29), sDrive30i(G29)
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BMW Z4 LITHIUM DUAL STORAGE BATTERY
Part Number: 61215B3F325
$871.65 MSRP: $1071.43
You Save: $199.78 (19%)
ADD TO CART
Product Specifications
- Other Name: Battery
- Replaced by: 61215B80880
- Replaces: 61-21-5-A8D-7E0, 61-21-5-A46-EA1, 61-21-5-A4A-F23, 61-21-5-A38-DE7
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2021-2025 BMW Z4 | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS
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BMW Z4 Ep Battery 70Ah
Part Number: 61212353806
$108.08 MSRP: $145.00
You Save: $36.92 (26%)
Product Specifications
- Replaced by: 61212353817
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2016 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85), sDrive28i(E89), sDrive30i(E89), sDrive35i(E89), sDrive35is(E89)
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BMW Z4 Ep Battery 80Ah
Part Number: 61212353808
$151.99 MSRP: $195.00
You Save: $43.01 (23%)
Product Specifications
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2016 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85), sDrive28i(E89), sDrive30i(E89), sDrive35i(E89), sDrive35is(E89)
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BMW Z4 Ep Battery 70Ah
Part Number: 61212353811
$198.32 MSRP: $247.10
You Save: $48.78 (20%)
Product Specifications
- Replaced by: 61215A40E19
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2016 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85), sDrive28i(E89), sDrive30i(E89), sDrive35i(E89), sDrive35is(E89)
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BMW Z4 Ep Battery 80Ah
Part Number: 61212353813
$204.81 MSRP: $255.21
You Save: $50.40 (20%)
Product Specifications
- Replaced by: 61215A40E31
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2009-2016 BMW Z4 | sDrive28i(E89), sDrive30i(E89), sDrive35i(E89), sDrive35is(E89)
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BMW Z4 Battery, Manuf.: Exide (Warranty Only)
Part Number: 61217586961
$139.89 MSRP: $158.33
You Save: $18.44 (12%)
Product Specifications
- Other Name: Battery
- Replaces: 61-21-6-946-333
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2008 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85)
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BMW Z4 ORIGINAL BMW AGM-BATTERY
Part Number: 61216806755
$254.70 MSRP: $329.91
You Save: $75.21 (23%)
Product Specifications
- Other Name: Battery
- Replaces: 61-21-6-924-023
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2025 BMW Z4 | 4 Cyl 2.0 L GAS, 6 Cyl 3.0 L GAS, sDrive30i(G29)
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BMW Z4 ORIGINAL BMW AGM-BATTERY
Part Number: 61217604808
$264.12 MSRP: $332.07
You Save: $67.95 (21%)
Product Specifications
- Other Name: Battery
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2020 BMW Z4 | M40i(G29)
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BMW Z4 Original Bmw Agm-Batterie 90Ah
Part Number: 61216924023
$254.70 MSRP: $329.91
You Save: $75.21 (23%)
Product Specifications
- Replaced by: 61216806755
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW Z4 | sDrive30i(G29)
View related parts
BMW Z4 12-V LITHIUM DUAL STORAGE SY
Part Number: 61215A078B0
Product Specifications
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW Z4 | sDrive30i(G29)
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BMW Z4 Battery, Manuf.: Douglas (Warranty Only)
Part Number: 61218381738
$103.15 MSRP: $123.00
You Save: $19.85 (17%)
Product Specifications
- Other Name: Battery
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2008 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85)
View related parts
BMW Z4 Battery, Manuf.: Douglas (Warranty Only)
Part Number: 61218381749
$114.05 MSRP: $136.00
You Save: $21.95 (17%)
Product Specifications
- Other Name: Battery
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2008 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85)
View related parts
BMW Z4 Battery, Manuf.: Exide (Warranty Only)
Part Number: 61217591080
$166.53 MSRP: $207.90
You Save: $41.37 (20%)
Product Specifications
- Other Name: Battery
- Replaces: 61-21-6-928-682
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2008 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85)
View related parts
BMW Z4 Battery, Manuf.: Exide (Warranty Only)
Part Number: 61217598775
$168.40 MSRP: $190.60
You Save: $22.20 (12%)
Product Specifications
- Other Name: Battery
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2009-2016 BMW Z4 | sDrive28i(E89), sDrive30i(E89), sDrive35i(E89), sDrive35is(E89)
View related parts
BMW Z4 Battery, Manuf.: Exide (Warranty Only)
Part Number: 61217586960
$174.96 MSRP: $218.41
You Save: $43.45 (20%)
Product Specifications
- Other Name: Battery
- Replaces: 61-21-6-946-332
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2003-2008 BMW Z4 | 2.5i(E85), 3.0i(E85), Coupe 3.0si(E86), Roadster 3.0i(E85), Roadster 3.0si(E85)
View related parts
BMW Z4 12-V LITHIUM DUAL STORAGE SY
Part Number: 61219857516
$646.20 MSRP: $754.09
You Save: $107.89 (15%)
Product Specifications
- Replaces: 61-21-9-442-935
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW Z4 | sDrive30i(G29)
View related parts
BMW Z4 12-V LITHIUM DUAL STORAGE SY
Part Number: 61219442935
Product Specifications
- Replaced by: 61219857516
- Warranty: This genuine part is guaranteed by BMW's factory warranty.
Fits the following Vehicles:
- 2019-2020 BMW Z4 | sDrive30i(G29)

BMW Z4 Batteries

The first surge of life for a BMW Z4 is given by Batteries. It presents your roadster with immediate electronic energy for its starter, ignition, fuel injection, and components before the engine begins to charge itself. Batteries steady voltage, run radio with engine off, and preserve memory and the clock during long parking spells in every BMW, and then there are startups. Early Z4 models applied conventional flooded lead acid units containing porous lead plates soaked in acid that needed periodic watering. Subsequent BMW sporting automobiles transitioned to maintenance-free Batteries, as well as absorbed glass mat variants that lock acid in fiberglass to resist vibration and offer higher CCA for cold starting. Both styles still deliver 12 volts from six cells, but AGM Batteries can tolerate deep discharge better than others and have a longer reserve capacity. This will be a plus when the Z4 sits with lights or infotainment on. With matching group size, terminal style, CCA, and reserve capacity, the BMW system fits snugly to spark reliably even in the frost. The recent Z4's high cold cranking amp (CCA) is appropriate for regions with cold winter conditions, and the strong reserve is capable of powering hungry components while maintaining the Batteries in a steady state until either the alternator or the converter takes over.

If you are looking for OEM BMW Z4 Batteries, we highly recommend to shop with us. Not only do we offer budget friendly prices, but we also provide fast delivery. In addition, we have a hassle-free return policy on all genuine BMW Z4 Batteries that come backed by the manufacturer's warranty.

BMW Z4 Batteries Parts Questions & Experts Answers

Battery, Manuf.: Douglas (Warranty Only)
61218381749
Q:
How to accurately measure the voltage of the batteries on BMW Z4?
Posted by Masruque A.
A:
To measure the battery voltage accurately, the top charge must be removed. Achieving this involves switching on the higher lights for a period of ten seconds and then turning them off to allow the vehicle stay for about two minutes. Battery check begins by taking off the battery cover and unplugging both the negative and positive Battery Cables. The indicator eye at the top of the battery should be visually examined; it has to be black meaning that it should be charged if yellow or replaced in case of defects. Open circuit voltage is measured using a digital voltmeter, which should give about 12.6 volts for a fully charged battery. Charge your battery first if it is less than this value before you proceed with other steps. A load tester is next used to carry out a load test on your battery. Connect this device to your terminals, apply its load within fifteen seconds without letting your cells' voltage drop below 9.6 volts. When it is weak or defective, an indication will appear in a load tester's display window. During replacement of one's battery, check with dealer parts department or auto parts store that sells batteries so as to get accurate choice of battery required in such cases. Remove relevant trim panels and also loosen up the positive plus negative cables connected to my battery Remove relevant trim panels and also loosen up the positive plus negative cables connected to my batter Ensure that there is no corrosion beneath your cells after lifting them out carefully as they are heavy Avoid being careful when lifting out my cell due to its weight; look at underneath if corroded clean It should first connect new batteries and lastly attach negatives.
Answered by BMW Parts Specialist Chaz / Sep 17, 2023