Best Battery For Bmw 328I: Compare AGM Group Sizes

#1 · Best Overall

1. WEIZE Platinum AGM Group 49

• Dimensions: 6.89"D x 13.9"W x 7.48"H
• Weight: 56.4 lb
• Voltage: 12 V DC

Best for: Group 49 AGM shoppers.

Why it ranks #1: Its Group 49/H8 format, 95Ah capacity, 900 CCA, and stated three-year warranty make it a well-specified choice when that size matches your BMW.

The WEIZE Platinum pairs 95Ah capacity with a 900 CCA rating, giving Group 49 replacement shoppers two useful figures for comparing reserve and starting needs. Its 12V AGM format and specified H8 dimensions help narrow compatibility checks for a BMW 328i, where the required battery size can vary by configuration.

At 13.9 by 6.89 by 7.48 inches, the listed dimensions match the Group 49/H8 format named in the title, making it easier to compare the case with the battery being replaced. The 160-minute reserve capacity gives buyers another measure to consider alongside 95Ah capacity, while 900 CCA addresses the starting-output comparison. Its 56.4-pound listed weight is relevant when planning removal and installation; vehicle-specific fit still depends on the existing battery specification.

Skip it if you need a smaller, lighter starting battery; OPTIMA REDTOP 35 weighs 31.7 pounds and measures 9.38 inches long.

This WEIZE is a practical candidate for a 328i owner replacing a Group 49/H8 battery and comparing capacity, reserve, and cranking figures. Its 56.4-pound weight and substantial case make handling and exact battery-tray fit important considerations.

Listed on Amazon as: Weize Platinum AGM Battery BCI Group 49-12v 95ah H8 Size 49 Automotive Battery, 160RC, 900CCA, 36 Months Warranty, Dimensions 13.9" L x 6.89" W x 7.48" H

#2 · High Capacity

2. Marxon Group 49 AGM

Best for: H8 AGM replacement shoppers.

Why it ranks #2: This Group 49/H8 AGM provides 95Ah and 900 CCA in dimensions matching the listed WEIZE battery, but its listing gives no warranty term.

A 95Ah capacity paired with 900 CCA gives this MARXON Group 49 battery a clear combination of reserve and starting output. Its AGM construction is maintenance-free, while the listed BCI 49, DIN H8 and L5 size references help shoppers compare it with a BMW 328i battery already in the car.

The 12V rating and 13.9-by-6.89-by-7.48-inch dimensions offer concrete checks for a replacement installation, and the A1 terminal specification adds another comparison point. MARXON identifies the battery as BCI 49/H8/L5, but notes that vehicle configurations can vary—even within a model—so matching the existing battery matters. Its 95Ah capacity and 900 CCA are useful reference figures when assessing reserve and cranking needs; the maintenance-free AGM format avoids routine battery maintenance.

Skip it if you need a shorter Group 94R case; the MARXON Group 94R H7 measures 12.4 inches long.

For a 328i owner whose existing battery matches the Group 49/H8/L5 dimensions and terminals, this MARXON offers a maintenance-free AGM option with substantial listed capacity. Check the installed battery size before choosing it; BMW fitments vary.

Listed on Amazon as: Marxon Group 49 Car Battery 12v 95AH 900CCA H8 AGM Batteries Maintenance Free Automotive Start Stop Replacement L5 Battery for Audi BMW Ford Toyota Mercedes-Benz Volvo

#3 · Replacement Warranty

3. ACDelco Gold 49AGM

• Dimensions: 6.9"D x 13.9"W x 7.5"H
• Weight: 35.2 lb
• Voltage: 12 V

Best for: Group 49 AGM replacement seekers.

Why it ranks #3: The Group 49 AGM has a stated 36-month free-replacement limited warranty and dimensions of 13.9 by 6.9 by 7.5 inches.

ACDelco’s Group 49 AGM pairs a puncture-resistant envelope separator with improved acid circulation, which the product description says helps prevent shorts and keep the battery cool. Its high-density negative paste and silver-calcium alloy add specified performance and cycle-life benefits for shoppers comparing construction.

The 12V battery measures 13.9 by 6.9 by 7.5 inches, making a direct comparison with the BMW 328i’s installed Group 49 battery the first fit check. ACDelco says the calcium-lead positive grid maximizes conductivity and allows low resistance, while the separator supports circulation and helps prevent shorts. The AGM description also cites high cycling capability and charge receptivity for start-stop applications. These features matter only if the vehicle’s required size and terminals match.

Skip it if you need listed CCA and capacity figures; WEIZE Platinum AGM specifies 900 CCA and 95Ah.

For a 328i owner confirming Group 49 fit, this ACDelco offers AGM construction with documented grid and separator features. Its listing does not supply CCA or amp-hour ratings, so buyers who compare output figures should account for that information gap.

Listed on Amazon as: ACDelco Gold 49AGM (88864539) 36 Month Warranty AGM BCI Group 49 Battery

#4 · High Reserve

4. ACDelco Gold 49AGMHR

• Dimensions: 7.5"D x 13.9"W x 6.9"H
• Weight: 55.6 lb
• Voltage: 12 V DC

Best for: Group 49 high-reserve shoppers.

Why it ranks #4: This Group 49 high-reserve AGM has a stated 36-month limited warranty; compare its 13.9 by 7.5 by 6.9-inch dimensions with the installed battery.

ACDelco identifies this 49AGMHR as a high-reserve AGM in BCI Group 49, giving buyers a direct size category and reserve-focused description. Its 13.9-by-7.5-by-6.9-inch dimensions make it possible to compare the case against a BMW 328i’s installed battery before considering the vehicle-fit claim.

The 12V battery is listed for passenger cars, and ACDelco says it is manufactured to meet fit, form, and function specifications for GM vehicles and most makes and models. That broad statement is useful context, not a substitute for checking a 328i’s battery group and terminals. The high-reserve designation may interest buyers seeking reserve capability, but the supplied specifications give no capacity or CCA figure to quantify it. Confirm the existing battery dimensions before installation.

Skip it if you require published CCA and capacity figures; WEIZE Platinum AGM lists 900 CCA and 95Ah.

This ACDelco is worth considering for a 328i owner whose current battery matches Group 49 and who values a high-reserve designation. Buyers comparing quantified capacity and cranking output will need figures not provided in this listing.

Listed on Amazon as: ACDelco Gold 49AGMHR (88866099) 36 Month Warranty High Reserve AGM BCI Group 49 Battery

#5

5. Marxon Group 94R AGM

• Dimensions: 6.89"D x 12.4"W x 7.48"H
• Weight: 52.8 lb
• Voltage: 12 V

Best for: Group 94R start-stop users.

Why it ranks #5: Its 94R/H7 format, 80Ah capacity, and 850 CCA serve BMWs requiring this shorter AGM size, though the listing does not confirm 328i fitment.

MARXON lists 40% faster charging than an SLA battery for this Group 94R AGM, a concrete point for owners comparing charge recovery. The 80Ah capacity, 850 CCA, and start-stop compatibility make its intended use clearer, while the 12.4-inch case offers a shorter alternative to Group 49 batteries.

This 12V battery measures 12.4 by 6.89 by 7.48 inches and is identified as BCI 94R, DIN H7, or L4, giving buyers several size labels to compare with the installed BMW battery. Its 80Ah and 850 CCA figures describe capacity and starting output, while maintenance-free AGM construction avoids routine maintenance. MARXON lists start-stop use and faster charging than SLA; the actual vehicle still needs to match the Group 94R case and terminal layout.

Skip it if you prioritize 95Ah capacity in a Group 49 case; WEIZE Platinum AGM lists both specifications.

This MARXON suits a 328i owner whose existing battery is Group 94R/H7/L4 and who wants AGM start-stop compatibility. Its 80Ah rating and shorter case set a clear boundary, so match the old battery’s size and output first.

Listed on Amazon as: MARXON Group 94R H7 L4 Car Battery 12v 80AH 850CCA AGM Maintenance Free

#6

6. ACDelco Gold 94RAGM

• Dimensions: 6.9"D x 12.4"W x 7.5"H
• Weight: 51.6 lb
• Voltage: 12 V

Best for: Group 94R AGM replacement.

Why it ranks #6: This Group 94R AGM measures 12.4 by 6.9 by 7.5 inches and includes a stated 36-month limited warranty for vehicles requiring that size.

ACDelco’s Group 94R AGM combines a high-density negative paste with a silver-calcium alloy specified to improve performance and cycle life. Those internal features, alongside a calcium-lead grid for conductivity, give BMW 328i shoppers more to compare than the case size alone when selecting a replacement battery.

The 12V case measures 12.4 by 6.9 by 7.5 inches, providing a useful physical check against an existing Group 94R installation. ACDelco says its puncture-resistant envelope separator promotes acid circulation and helps prevent shorts, while improved circulation helps the battery remain cool. The product description also identifies AGM batteries as high-cycling and charge-receptive for start-stop applications. Match the listed dimensions and battery group to the vehicle before relying on those construction benefits.

Skip it if you want listed capacity and CCA figures for comparison; MARXON Group 94R H7 specifies 80Ah and 850 CCA.

For a 328i owner confirming a Group 94R fit, this ACDelco offers AGM construction with detailed plate and separator features. Buyers who require published CCA or amp-hour figures for selection will need specifications beyond those supplied here.

Listed on Amazon as: ACDelco Gold 94RAGM (88864542) 36 Month Warranty AGM BCI Group 94R Battery

#7 · Highest Capacity

7. Mighty Max MM-H9 AGM

• Dimensions: 15.51"D x 6.88"W x 7.48"H
• Weight: 64 lb
• Voltage: 12 V

Best for: High-reserve Group 95R shoppers.

Why it ranks #7: Its 100Ah capacity, 950 CCA, and 190-minute reserve capacity are substantial, but its 15.51-inch length and Group 95R designation require careful fit checking.

A 190-minute reserve capacity is the central draw of this Mighty Max MM-H9, paired with 100Ah and 950 CCA. Those figures give BMW 328i shoppers a high-capacity Group 95R option to compare when reserve and starting output matter, though its unusually long 15.51-inch case needs close attention.

The 12V AGM is listed at 15.51 by 6.88 by 7.48 inches and 64 pounds, making case length and installation handling important parts of the decision. Its sealed, spill-proof construction is described alongside high discharge output and deep-discharge recovery, supporting steadier power through demanding draws. The 100Ah capacity, 950 CCA, and 190-minute reserve provide multiple comparison points; its Group 95R designation should be matched to the vehicle’s existing battery before ordering.

Skip it if you need a shorter Group 49 battery; WEIZE Platinum AGM measures 13.9 inches long.

For a 328i owner whose battery space accepts Group 95R, the MM-H9 pairs high listed capacity with substantial reserve and sealed AGM construction. Its 15.51-inch length and 64-pound weight make fit and handling central boundaries.

Listed on Amazon as: Mighty Max Battery MM-H9 Start and Stop Car BCI Group 95R 12V 100AH, 190RC, 950CCA Rechargeable AGM Car Battery

#8

8. ACDelco Gold 48AGM

• Dimensions: 7.5"D x 11.9"W x 7.6"H
• Weight: 45.5 lb
• Voltage: 12 V

Best for: Cycle-conscious AGM buyers.

Why it ranks #8: The Group 48 AGM offers a stated 36-month limited warranty and start-stop suitability, but its 11.9-inch length makes size verification essential.

A robust envelope separator with a puncture-resistant back supports acid circulation while helping prevent shorts, making this ACDelco Group 48 AGM notable for its internal construction. Its high-density negative paste and silver-calcium alloy are also specified to improve performance and cycle life, useful details for shoppers comparing battery design.

The 12V battery measures 11.9 by 7.5 by 7.6 inches, so its Group 48 case should be compared directly with the existing BMW 328i battery before purchase. ACDelco says the calcium-lead positive grid maximizes conductivity and allows low resistance, while improved acid circulation helps the battery remain cool. Its AGM description cites high cycling capability and charge receptivity, features relevant to start-stop applications; the listed Group 48 size remains the central fit check.

Skip it if you need a Group 49 case; ACDelco Gold 49AGM uses that listed battery size.

For a 328i owner whose existing setup takes Group 48, this ACDelco combines AGM construction with specified cycle-life and circulation features. Its shorter case is a firm boundary: verify the installed size rather than assuming every 328i uses Group 48.

Listed on Amazon as: ACDelco Gold 48AGM (88864541) 36 Month Warranty AGM BCI Group 48 Battery

#9

9. Optima 35 Redtop AGM

• Dimensions: 6.75"D x 9.38"W x 7.69"H
• Weight: 31.7 lb
• Voltage: 12 V

Best for: Compact high-cranking battery buyers.

Why it ranks #9: This 720 CCA AGM weighs 31.7 pounds, but its 9.38-inch length and 44Ah capacity differ considerably from the larger Group 49 and 94R options.

OPTIMA’s SpiralCell technology uses 99.99% pure lead and is paired with a 720 CCA rating, giving this REDTOP a distinct focus on starting power. At 31.7 pounds and 9.38 inches long, its compact listed dimensions also make it a different form factor from Group 49 replacement batteries.

The 12V battery provides a 90-minute reserve capacity and 44Ah C20 capacity, figures that help buyers weigh reserve against its starting-oriented design. OPTIMA says SpiralCell technology delivers more power than conventional flat-plate batteries and supports starting in bad weather; the description also identifies it for heavy use and off-road applications. Its 9.38-by-6.75-by-7.69-inch dimensions and SAE post terminals need direct comparison with the BMW’s installed battery and connections.

Skip it if you need a 95Ah Group 49 battery; MARXON Group 49 lists that capacity and a matching size designation.

This OPTIMA makes sense for a buyer prioritizing a compact, starting-focused AGM and checking its SAE posts against the car. Its smaller case and 44Ah C20 capacity make it a poor assumption as a direct Group 49 replacement.

Listed on Amazon as: OPTIMA® Batteries High Performance 35 REDTOP® Sealed AGM Battery

#10

10. Optima D51 Yellowtop AGM

• Dimensions: 5.06"D x 9.31"W x 8.94"H
• Weight: 19.4 lb
• Voltage: 12 V

Best for: Accessory-loaded vehicle owners.

Why it ranks #10: The D51 is a dual-purpose AGM with starting and deep-cycle capability, but its compact 9.31-inch length makes it the least supported fit for this BMW search.

The OPTIMA YELLOWTOP is a dual-purpose AGM with both starting and deep-cycle power, a useful combination for vehicles running demanding accessories. OPTIMA specifically cites high-demand audio systems and winches, while its vibration resistance and rechargeability add relevant considerations for buyers who draw power beyond routine starting.

Its 12V rating and compact 9.31-by-5.06-by-8.94-inch dimensions provide a starting point for checking whether it fits a BMW 328i’s battery space, though the listed case is not a Group 49 size. The product is described as having premium cranking power and cycling capability, enabling use where accessories repeatedly draw power. OPTIMA also specifies resistance to vibration; the 19.4-pound weight may ease handling, but physical fit and terminal compatibility remain decisive.

Skip it if you need a Group 49 replacement with 95Ah capacity; WEIZE Platinum AGM lists those specifications.

Choose this YELLOWTOP when a 328i owner has high accessory demand and the vehicle’s battery space accepts its compact case. Its dual-purpose capability is relevant, but its dimensions are not a substitute for confirming the car’s required battery group.

Listed on Amazon as: OPTIMA® Batteries High Performance D51 YELLOWTOP® Sealed AGM Battery