Group 35 Batteries - Dimensions, Features and Recommendations

group35batteries mBCI Group 35 batteries are very popular battery size of lead-acid batteries, commonly used in cars, trucks, RVs and other similar applications as starting or dual-purpose batteries.

These batteries, especially dual purpose and deep cycle batteries, are often used in other applications as well, like UPS batteries, wheelchair batteries, security system backup batteries, medial applications, off-the-grid etc.

Most popular BCI Group 35 batteries are Absorbent Glass Mat (AGM) Sealed Lead Acid (SLA) batteries, but the lithium iron phosphate (LiFePO4) batteries are slowly entering the market, at least for deep cycle applications.

Group 35 batteries are medium size batteries, featuring 20h capacity in 44-65 Ah range, providing 620-850 CCA, 90-130 minutes RC etc.

Their physical dimensions are approximately (LxWxH) 9 1/16 x 6 7/8 x 8 7/8 inches (9.0625 x 6.875 x 8.875 inches, 230 x 175 x 225 mm), while their electrical features depend on the battery design, intended use, chemistry etc.

Group 35 Batteries Comparison Chart

The following chart lists the most popular group 35 batteries, with their most important features (batteries are ordered alphabetically):

Model Battery Type Chemistry Ah CCA MCA RC Weight Review
Arc-Angel Group 35 Starting LiFePO4 40 900 - - 16 lbs; 7.3 kg -
Delphi BU9035 Dual Purpose AGM 50 680 - 100 40 lbs; 18.1 kg -
DieHard 38275 Dual Purpose AGM  50 650 - 100 42 lbs; 19.0 kg -
NorthStar NSB-AGM35 Dual Purpose  AGM 60 740 880 115 49 lbs; 22.2 kg -
Optima 8020-164 35 RedTop Starting  AGM 44 720 910 90 31.7 lbs; 14.4 kg Optima 35 RedTop
Optima 8040-218 35 YellowTop Dual Purpose  AGM 48 620 770 98 36.4 lbs; 16.5 kg -
Odyssey 35-PC1400T Dual Purpose  AGM 65 850 950 130 50 lbs; 22.7 kg -

Note: Amazon links in the table open in the new windows ('Model' column), feel free to check them for most up-to-date prices and offers.

Group 35 Batteries Dimensions, Weight, Chemistry, Features

Again, physical dimensions of Group 35 batteries are approximately (LxWxH) 9 1/16 x 6 7/8 x 8 7/8 inches (9.0625 x 6.875 x 8.875 inches, 230 x 175 x 225 mm) - we have to emphasize this since many group 35 batteries are slightly longer than 'standard maximum length'.

This difference is not large - some of the batteries are less than half of an inch longer than they should be, but since they are intended mostly for cars and similar applications with some room to spare around the battery, they can easily fit such battery compartments.

But, nonetheless, be sure to measure the battery compartment first and check that the battery may fit such battery compartment even if it is somewhat larger than the recommended standard.

Most group 35 batteries are spill-proof AGM batteries, designed either as dual purpose or as a starting batteries.

Some of the models are declared as dual purpose batteries, but in essence, they are starting batteries with increased tolerance toward cycling applications, which is very important for modern vehicles where main battery has to provide large currents in order to start main engine (gas, diesel), but also it has to be able to power different electric and electronic systems while the engine is turned off, like audio systems, ventilators, lights, security systems, etc.

The following chart lists the most popular group 35 battery prices, with the batteries being ordered alphabetically from the left to the right:

As one can see, battery features are more or less evenly matched with the battery prices.

Lithium ion batteries are present in the form of Lithium Iron Phosphate (LiFePO4) batteries, which is practically the safest lithium battery chemistry type.

Lithium ion batteries feature Battery Management Systems (BMS) that monitor battery parameters and if necessary, they protect the battery by cutting it off from the rest of electric circuit - they offer over-voltage, over-charge, over-current, over-discharge, over-temperature protection and they also often balance individual cells.

Such Battery Management Systems ensures that lithium ion batteries may be used as drop-in replacements for AGM SLA batteries.

However, most lithium ion batteries on the market are deep cycle batteries with limited output currents down to 50-100 Amps, model dependent.

But, there are also lithium ion batteries designed as starting batteries which outperform most AGMs with ease, and that are at most half the weight of AGMs. Just don't ask about the price :)

Arc-Angel Group 35 LiFePO4 Battery

arc angel group35 w250Arc-Angel Group 35 LiFePO4 Battery is true starting/cranking battery with CCA value of 900 Amps.

Its physical dimensions are 9.37x6.77x8.70 inches (238x172x221), so it is slightly longer than 'standard' group 35 battery.

But, it weighs only 16 pounds (15.99 pounds according to the manufacturer), which is half of the Optima 8020-164 35 RedTop AGM starting battery and less than one third of the Odyssey 35-PC1400T and NorthStar NSB-AGM35.

Arc-Angel Group 35 LiFePO4 Battery is designed as drop-in replacement for group 35 AGM/Gel-Cell/Wet lead-acid batteries and may be charged with onboard alternators.

However, it is recommended by the manufacturer to charge it, if possible, with lithium-ion battery chargers. Its nominal capacity is 40 Ah.

It is maintenance-free battery, with extra low self-dicharge rate - it is claimed by the manufacturer that it is able to start the car even after one year of storage.

Since these batteries are not very long on the market, at least not when being compared with AGMs, reviews from other users are not very numerous, although the battery itself is often praised by the users.

Arc-Angel Group 35 LiFePO4 Battery comes with 10-year(!) warranty.

For more reviews and recommendations, feel free to check Arc-Angel Group 35 Amazon link (link opens in the new window).

Delphi BU9035 AGM Group 35 Battery

delphi bu9035 w250Delphi BU9035 AGM Group 35 Battery is described as dual purpose battery, but it is starting battery with improved tolerance toward deep discharge and cycle applications.

This is very balanced design, offering 680 CCA, 100 minutes RC, and 50 Ah 20h capacity, all packaged in not too heavy 40 lbs battery.

Also, considering its performances, it is also reasonably priced battery.

Physical dimensions of the Delphi BU9035 AGM Group 35 Battery are Height: 7.75, Width: 6.75, Length: 9.563 inches - it is also slightly longer than 'standard' group 35 battery.

DieHard 38275 AGM Group 35 Battery

diehard 38275 w250DieHard 38275 AGM Group 35 Battery is very similar to Delphi BU9035 in terms of performances: 650 CCA, 100 minutes RC and 50 Ah 20h capacity.

Also, it weighs very acceptable 42 pounds.

As an AGM battery, DieHard 38275 is spill-proof, maintenance-free group 35 battery, with increased vibration resistance and improved tolerance to cyclic and deep discharge applications.

Nonetheless, it performs best as starting battery in gas and diesel cars, trucks and other vehicles that are not overburden by multimedia devices and other similar electronics.

NorthStar NSB-AGM35 AGM Group 35 Battery

northstar nsb agm35 w250NorthStar NSB-AGM35 is true 'heavyweight' among the group 35 batteries and it weighs 49 pounds, just one pound less than Odyssey 35-PC1400T battery.

But, NorthStar NSB-AGM35 is also an excellent performer, featuring 60 Ah capacity, 740 CCA, 880 MCA, and 115 minutes RC - it is the only dual-purpose battery that comes close to the Odyssey group 35 battery in terms of performances.

NorthStar NSB-AGM35 physical dimensions are (LxWxH) 9.45x6.76x8.54 inches - another slightly longer than 'standard' group 35 battery.

NorthStar NSB-AGM35 uses plates made of pure lead, ensuring good starting features and deep cycle applications - battery is able to cycle over 900x when being discharged down to 50% DoD (Depth of Discharge).

Price? Well, what you pay is what you get - excellent and reliable battery with very nice price tag.

Optima Batteries 8020-164 35 RedTop Starting Battery

optima 35 redtop w250Optima 8020-164 RedTop is the only 'true' starting battery in our list.

Optima 8020-164 RedTop is made using spiral wound plates, offering large surface at relatively low weight - it weighs only 31.7 pounds, which is ~65% of NorthStar NSB-35AGM and Odyssey 35-PC1400T battery.

In terms of starting/cranking performances, Optima 8020-164 RedTop features 720 CCA (740 CCA NorthStar, 850 CCA Odyssey) and 910 MCA (880 MCA NorthStar, 950 MCA Odyssey) - excellent cranking characteristics for such lightweight AGM battery.

Optima 8020-164 RedTop physical dimensions are 9.38 x 6.75 x 7.69 inches (it is also wider than the 'standard' 9 1/16").

20h capacity is 'just' 44 Ah and RC value is 90 minutes - Optima 8020-164 RedTop is not designed for anything but cranking/starting applications.

Optima 8040-218 35 YellowTop Dual Purpose Battery

optima 35 yellowtop w250Optima 8040-218 YellowTop feature the same design philosophy like Optima 8020-164 RedTop battery - spiral wound plates, AGM battery type.

Optima 8040-218 YellowTop is intended for both starting and deep cycling applications, making it a true dual-purpose battery being able to provide 620 CCA, 770 MCA, 98 minutes RC and featuring 48 Ah 20h capacity.

Also, it is slightly heavier than RedTop - 36.4 vs 31.7 pounds, while the physical dimensions are the same.

Generally, Optima 8040-218 YellowTop is not as popular as RedTop version, but it is nonetheless, one of the most popular group 35 batteries, used broad range of applications where both starting power and deep discharges are required.

Odyssey 35-PC1400T Automotive and LTV Battery

odyssey 35 pc1400 w250Odyssey 35-PC1400T is the heaviest AGM SLA group 35 battery on our list - it weighs 50 pounds (22.7 kg), but it also outperforms other batteries as well:

- 20h capacity is 65 Ah - nearest rival is NorthStar NSB-AGM35 with capacity of 60 Ah,

- CCA rating of 850 Amps - nearest rival is NorthStar NSB-AGM35 with 740 CCA Amps,

- MCA rating of 950 Amps - nearest rival is Optima 35 RedTop with 910 MCA Amps,

- RC value of 130 minutes - nearest rival is NorthStar NSB-AGM35 with RC value of 115 minutes,

- it weighs 50 pounds - nearest rival is NorthStar NSB-AGM35 weighing 49 pounds.

Odyssey 35-PC1400T is true dual purpose battery - obviously, it is excellent starting battery, but it is also designed to tolerate at least 400 cycles down to 80% DoD (20% SoC - State of Charge).

It can be fully recharged in 4-6 hours, with no adverse effects on the battery.

Also, it is able to operate down to -40°F (-40°C) with somewhat decreased cranking amps, but nonetheless ...

With 3-10 years of service life, non-spillable, maintenance free design, Odyssey 35-PC1400T is one of the best, if not the best group 35 battery.

Note: Author of this article is somewhat biased toward the batteries with exceptional low temperature performances - and Odyssey batteries are such batteries.

Price? Well, just like NorthStar NSB-AGM35 battery, what you pay is what you get - an excellent, tough and reliable battery with a very fine price tag :)


Long Story Short: If You are looking for group 35 AGM starting battery, Optima RedTop is excellent choice - it is very good performer, especially considering its weight.

If you are looking for good, all-round group 35 battery, consider Delphi, DieHard or Optima YellowTop batteries - they all have their own pros and cons, just note that the Optima YellowTop has been tested by countless users in various real-life situations.

But, Delphi and DieHard models are more affordable batteries than Optima.

And if you are looking for best performer group 35 battery, consider either NorthStar NSM-AGM35 or Odyssey 35-PC1400 batteries - Odyssey clearly outperforms NorthStar by nice margin, but they are both good and reliable batteries.

If the price difference is large enough, go for NorthStar, if not, Odyssey 35-PC1400T is the right choice.

Model Battery Type Chemistry Ah CCA MCA RC Weight Review
Arc-Angel Group 35 Starting LiFePO4 40 900 - - 16 lbs; 7.3 kg -
Delphi BU9035 Dual Purpose AGM 50 680 - 100 40 lbs; 18.1 kg -
DieHard 38275 Dual Purpose AGM  50 650 - 100 42 lbs; 19.0 kg -
NorthStar NSB-AGM35 Dual Purpose  AGM 60 740 880 115 49 lbs; 22.2 kg -
Optima 8020-164 35 RedTop Starting  AGM 44 720 910 90 31.7 lbs; 14.4 kg Optima 35 RedTop
Optima 8040-218 35 YellowTop Dual Purpose  AGM 48 620 770 98 36.4 lbs; 16.5 kg -
Odyssey 35-PC1400T Dual Purpose  AGM 65 850 950 130 50 lbs; 22.7 kg -

Note: Amazon links in the table open in the new windows ('Model' column), feel free to check them for most up-to-date prices and offers.