Group 65 Batteries - Dimensions, Features and Recommendations

bci group 65 batteryBCI Group 65 batteries are commonly used as automotive, marine and industrial batteries. They are mid-size batteries, often designed as dual purpose AGM batteries suitable as both starting and deep cycle batteries, thanks to the advances in AGM SLA battery technology.

Generally, group 65 batteries feature 70-75 Ah 20h capacity, 130-150 minutes RC, 750-950 CCA with the MCA values of some models reaching almost 1100 Amps. Also, they usually weigh between 45 and 55 pounds (20 - 25 kg).

Lithium-ion BCI Group 65 batteries are not as common as AGM batteries, but they are slowly appearing on the market, offering many advantages over AGM batteries, but also having certain limitations.

BCI Group 65 Batteries Dimensions

BCI Group 65 batteries dimensions are (L x W x H) 12 1/2 x 7 1/2 x 7 9/16 inches (12.0625 x 7.5 x 7.5625 inches, 306 x 190 x 192 mm), or for short 12.1 x 7.5 x 7.6 inches.

Like most modern automotive, marine and industrial lead acid batteries, group 65 batteries are commonly made as Absorbent Glass Mat (AGM) Sealed Lead Acid (SLA) batteries, featuring improved vibration resistance, spill-proof design, low maintenance etc.

Lithium-ion BCI Group 65 batteries are commonly based on IFR-26650 cells featuring LiFePO4 (Lithium Iron Phosphate) chemistry. Their nominal voltage is 3.2 - 3.3 V per cell, with the maximum recommended charging voltage of 3.5 - 3.6 V per cell. Automotive, marine and industrial lithium ion batteries commonly feature (personally, must have!) Battery Management System (BMS) that monitors the battery condition and if required, protects the battery by shutting it off from the rest of the electric circuit.

Most popular BCI Group 65 batteries are given in the following table:

Model Battery Type Cell Type Ah CCA MCA RC Weight (lbs/kg) Review
ACDelco 65AGMHR Dual Purpose AGM 70 775 960 150 45.9 lbs; 20.8 kg -
Deka 9A65 Dual Purpose AGM 75 775 955 150 46 lbs;  20.85 kg -
Delphi BU9065 65 Dual Purpose AGM 75 750 - 150 47.5 lbs; 21.5 kg -
NORTHSTAR NSB-AGM65 Dual Purpose AGM 69 930 1070 135 55 lbs; 24.9 kg -
Odyssey 65-PC1750T Dual Purpose AGM 74 950 1070 145 54 lbs; 24.5 kg -
Renogy RBT100LFP12S-G1 Deep Cycle Lithium 100 - - ~230 26 lbs; 11.8 kg  

Note: Amazon affiliate links open in the new windows, feel free to check them for most up-to-date prices and offers.

Of course, there are other batteries on the market as well, but these are the most popular group 65 AGM batteries, especially ACDelco, NorthStar and Odyssey Group 65 batteries.

BCI Group 65 Features

Generally, most important group 65 battery features are:

- 70-75 Ah 20h capacity - when being drained for 20h, these batteries feature capacity in the 70-75 Ah range (3.5 - 3.75 Amps for 20h). Like all other AGM SLA batteries, when the discharge time is shorter, actual capacity is decreased. Lithium-ion group 65 batteries feature 20h capacity usually in the 100+ Ah range.

- 130-150 minutes RC (Reserve Capacity) - when being discharged with 25 Amps constantly, these batteries are able to operate up to 130-150 minutes. RC value is very important for deep cycle applications. RC value of lithium ion batteries in this size is usually in the 200+ minutes.

- 750-950 CCA (Cold Cranking Amps) - group 65 batteries are able to provide 750-950 Amps for 30 seconds, with the voltage NOT dropping below 7.2V, at 0°F (-18°C). And that is rather cold, IMHO of course.

- 950 - 1070 MCA (Marine Cranking Amps) or just CA (Cranking Amps) - group 65 batteries are able to provide 950 - 1070 Amps for 30 seconds, with the voltage NOT dropping below 7.2V, at at 32°F (0°C).

- weight between 45 and 55 pounds (20 - 25 kg) and can be more-or-less easily carried around by adults using built in handles. Lithium group 65 batteries usually weigh around 11-14 kg, offering great weight savings.

Note: these values are given for the new, fully charged batteries and in real life, one should not always expect such values, especially when the battery is in use for some time. For more about these values, check our Battery Terms and Abbreviations - Glossary article.

acdelco 65agmhr battery

BCI Group 65 Recommendations

Group 65 batteries listed in the chart may be divided in several groups:

- batteries featuring CCA in 750-775 Amps range (ACDelco 65AGMHR battery, Deka 9A65 battery, Delphi BU9065 65 battery),

- batteries featuring CCA in 900+ Amps range (NorthStar NSB-AGM65, Odyssey 65-PC1750T),

- lithium ion battery, with extra long RC time and large number of charging/discharging cycles.

ACDelco 65AGMHR battery feature 70 Ah 20h capacity, 775 CCA, 960 MCA and 150 min RC. Also, it weighs 45.9 lbs (~20.8 kg).

Deka 9A65 battery feature 75 Ah 20h capacity, 775 CCA, 955 MCA, 150 min RC, and it weighs 46 lbs (~20.85 kg).

Delphi BU9065 65 battery feature 75 Ah 20h capacity, 750 CCA, calculated MCA of some ~930-940 Amps, 150 min RC, and it weighs 47.5 lbs (~21.5 kg).

Despite having smallest 20h capacity of these three batteries, ACDelco 65AGMHR battery is rather comparable, even better than Deka 9A65 and Delphi BU9065 65 batteries in some details (best MCA value, lightest design of these three batteries).

Also, ACDelco 65AGMHR battery feature better reviews from actual users when compared with Deka 9A65 and Delphi BU9065 65 batteries - if you are looking for affordable mid-range group 65 battery, consider ACDelco 65AGMHR battery.

northstar nsb agm65 battery

NorthStar NSB-AGM65 vs. Odyssey 65-PC1750T

Once again, we have NorthStar vs Odyssey battery comparison and once again, they are close, but not as close as in some other battery group sizes (for example, group 31 batteries NorthStar NSB-AGM31(M) and Odyssey 31M-PC2150 are so close that we still can't say which one is better battery - and yes, author(s) of these articles are generally biased regarding Odyssey batteries due to the real-life situations at very low temperatures...).

 When compared with Odyssey 65-PC1750T battery, NorthStar NSB-AGM65 is somewhat heavier (55 vs 54 lbs), it features shorter Reserve Capacity (135 vs 145 minutes), smaller CCA value (930 vs 950 Amps), and smaller 20h capacity (69 vs 74 Ah). Also, their MCA/CA values are exactly the same - 1070 Amps, and that is a lot of current.

As deep cycle battery NorthStar NSB-AGM65 is designed to withstand 900 cycles down to 50% of DoD (Depth of Discharge), while Odyssey 65-PC1750T tolerates up to 400 cycles down to 80% of DoD.

odyssey 65 pc1750t battery

So, which one is beter, NorthStar NSB-AGM65 or Odyssey 65-PC1750T? Since they feature very similar price, we would say that Odyssey 65-PC1750T is better battery than NorthStar NSB-AGM65.

But, those numbers are 'just' numbers - both batteries are excellent group 65 batteries and if the Odyssey 65-PC1750T is not available, feel free to get NorthStar NSB-AGM65.

Renogy 12V 100Ah Smart Lithium Iron Phosphate Battery - Model RBT100LFP12S-G1

renogy lithium smart 12v 10

Renogy RBT100LFP12S-G1 battery is lithium-ion battery based on the iron-phosphate chemistry (LiFePO4), featuring nominal voltage of 12.8 volts and 0.2C capacity of 100 Ah.

As the discharge rate is increased, its capacity also decreases, but not as nearly as the capacity of lead-acid batteries.

Physical dimensions of the battery are 11.4 x 6.8 x 7.4 inches (28.9 x 17.2 x 18.75 cm) and it weighs only 26 pounds (11.8 kg).

When the battery is being discharged at 0.2C rate (~20 Amps) it is able to withstand ~4000 (yes, four thousand!) charging/discharging cycles down to 80% DoD or ~7000 (again, seven thousand!) charging/discharging cycles down to 50% DoD.

Maximum continuous discharge current is 100 Amps, but the battery is also able to provide 130 Amps for 60 seconds. When the current reaches 150 Amps, BMS cuts the battery off, protecting it from any possible damage.

With the maximum charging current of 50 Amps, Renogy RBT100LFP12S-G1 may be charged rather quickly.

Renogy RBT100LFP12S-G1 is excellent low-current (<100 Amps) performer, very light, with large number of charging/discharging cycles.

Like all similar lithium batteries, Renogy RBT100LFP12S-G1 costs several times more than AGM batteries of similar capacity, making initial investment larger, but saving the money in the long run.


Like with everything in life, the performances of these batteries also come at the certain price. Here is the price comparison of BCI group 65 batteries:

Price of these batteries varies depending on their features, brands and if they are on sale or not - when choosing your next group 65 battery, consider their price, features, but also your own requirements and preferences:

Model Battery Type Cell Type Ah CCA MCA RC Weight (lbs/kg) Review
ACDelco 65AGMHR Dual Purpose AGM 70 775 960 150 45.9 lbs; 20.8 kg -
Deka 9A65 Dual Purpose AGM 75 775 955 150 46 lbs;  20.85 kg -
Delphi BU9065 65 Dual Purpose AGM 75 750 - 150 47.5 lbs; 21.5 kg -
NORTHSTAR NSB-AGM65 Dual Purpose AGM 69 930 1070 135 55 lbs; 24.9 kg -
Odyssey 65-PC1750T Dual Purpose AGM 74 950 1070 145 54 lbs; 24.5 kg -
Renogy RBT100LFP12S-G1 Deep Cycle Lithium 100 - - ~230 26 lbs; 11.8 kg  

Note: Amazon affiliate links open in the new windows, feel free to check them for most up-to-date prices and offers.

Group 65 1000 CCA Battery

As one can see, there is no group 65 1000 CCA battery on the market that is both reliable and feature AGM/SLA construction.

NorthStar NSB-AGM65 and Odyssey 65-PC1750T are very close (930 CCA and 950 CCA respectably), but not actually touching that magic '1000 CCA' mark.

For true 1000+ CCA batteries, check our Pick the Best 1000 CCA (Cold Cranking Amps) Marine Battery article.


Long Story Short: BCI Group 65 Batteries are used for automotive, marine, industrial, security, medical, off-the-grid and other similar applications where well balanced, dual purpose, low-maintenance batteries are required.

They differ in price, but they also differ in their features, so be sure to choose according to your own needs - if not sure, pay little extra and go for Odyssey 65-PC1750T or perhaps NorthStar NSB-AGM65 battery. If performances are not absolute requirement, ACDelco 65AGMHR has proved itself as good battery in many real life applications.