BCI Group 24 Batteries

BCI Group 24 Batteries are very popular general-purpose batteries, commonly used as wheelchair batteries, trolling motor batteries, in off-the-grid systems, as sump pump backup battery, etc.

Most modern BCI Group 24 batteries are Sealed Lead Acid (SLA) Absorbent Glass Mat (AGM) batteries, although there are also other types and chemistries on the market as well.

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BCI Group 24 Batteries Dimensions

BCI Group 24 Batteries are medium size batteries, featuring BCI standard dimensions of 10.25 x 6.8125 x 8.875 inches (260 x 173 x 225 mm), the typical capacity of 75-85 Ah, typical CCA of 500-840 Amps and RC values of 120-180 minutes.

However, there are several group 24 sub-models differing slightly in dimensions:

BCI Group Size L (mm) W (mm) H (mm) L (inches) W (inches) H (inches)
24 260 173 225 10 1/4 6 13/16 8 7/8
24F 273 173 229 10 3/4 6 13/16 9
24H 260 173 238 10 1/4 6 13/16 9 3/8
24R 260 173 229 10 1/4 6 13/16 9
24T 260 173 248 10 1/4 6 13/16 9 3/4

Note: when changing the group 24 battery (or any other similar battery), it is important to measure the available battery compartment and to check actual dimensions and terminal type and orientation of the new battery, before making a purchase - just in case ...

BCI Group 24 Batteries vs. BCI Group 34 Batteries

BCI Group 24 batteries and BCI Group 34 batteries are very similar in size, sharing same length and width, and differing only in height:

- Group 24: 10.25 x 6.8125 x 8.875 inches (260 x 173 x 225 mm),

- Group 34: 10.25 x 6.8125 x 7.875 inches (260 x 173 x 200 mm).

Because of this one inch (~25 mm) difference, Group 24 batteries feature larger volume and capacity, but they are also heavier. 

Group 34 batteries may fit easily in the Group 24 battery compartments, but other way around is not always possible.

BCI Group 24 Batteries Features and Specifications

The following chart lists some of the most popular BCI Group 24 batteries on the market with their most important features and specifications:

Model Battery Type Chemistry Ah CCA MCA RC Weight (lbs/kg) Review
ACDelco M24AGM Deep Cycle AGM 80 500 625 140 43.0 lbs; ~19.5 kg -
Exide Edge FP-AGM24F Dual Purpose AGM 60 710 - 120 46.2 lbs; 20.9 kg -
Lifeline GPL-24T Deep Cycle AGM 80 550 680 149 56.0 lbs; 25.5 kg -
Mighty Max ML75-12 Deep Cycle AGM 77 - - - 50.71 lbs; ~22.97 kg Mighty Max ML75-12
NorthStar NSB-AGM24F Dual Purpose AGM 76 840 1000 160 57 lbs; ~25.8 kg -
Trojan 24-Gel Deep Cycle Gel 77 - - 147 52 lbs; ~23.6 kg -
UPG UB12750 45821 Deep Cycle AGM 75 - - - 49.1 lbs; ~22.3 kg UPG UB12750
VMAXTANKS MB107-85 Deep Cycle AGM 85 - - 170 55 lbs; ~24.9 kg -
VMAXTANKS MR107-85 Deep Cycle AGM 85 - 700 160 55 lbs; ~24.9 kg -
VMAXTANKS SLR85 Deep Cycle AGM 85 - - 180 55 lbs; ~24.9 kg -
Weize FP12750 Deep Cycle AGM 75 - - - 47.2 lbs; ~21.4 kg -

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

BCI Group 24 batteries are mostly AGM batteries, although other chemistries are present on the market, too.

Starting group 34 batteries are rare - most models are deep-cycle, general-purpose batteries. Even so, due to their size, group 24 batteries feature CCA in the 500-840 Amps range, allowing especially dual-purpose models to be used in heavy industry, marine, and other similar applications.

If even stronger batteries are required, larger, group 31 batteries should be considered.

Group 24 Batteries as Sump Pump Backup Batteries

Sump pump power is usually labeled in HPs and it varies from small 0.25 and 0.5 HP pumps to large 2-3 and even more HPs sump pumps.

Note: HP value varies depending on its definition, but generally 1 HP equals to 746 watts.

Thus, 12 volts battery when powering different sump pumps must be able to provide:

- 0.25 HP: 187 watts, ~16 Amps @12 volts,

- 0.50 HP: 373 watts, ~32 Amps @12 volts,

- 0.75 HP: 560 watts, ~47 Amps @12 volts,

- 1.00 HP: 746 watts, ~63 Amps @12 volts.

1 HP and stronger sump pumps sometimes operate at 24 or even at 36 volts, requiring more batteries connected in series.

upg ub12750 w300Sump pump backup battery must spend months and sometimes even years in standby mode (a good trickle charger/battery maintainer as part of the sump pump backup system is very important), and provide reliable power at the moment notice.

As one can see, even small 0.50 HP sump pump motor requires 32 Amps @ 12 volts.

For example, UPG UB12750 is able to provide 36.0 Amps down to 11.1 volts for one hour easily and it is safe to assume that it is able to power 0.50 HP sump pump motor for one hour constantly, even with some energy left as a safety margin.

Depending on the sump pump operation, this 'one hour' may last much longer when such sump pump is being powered with UPG UB12750 or similar group 24 battery due to the On/Off type of operation.

Group 24 Batteries As Trolling Motor Batteries

Deep-cycle and dual-purpose group 24 batteries feature Reserve Capacity in the 120-180 minutes range - they are able to provide 25 Amps for 120-180 minutes before the voltage drops down to 10.5 volts, at 77°F (25°C).

Smaller kayak trolling motors usually feature maximum current draw in the 20-30 Amps range, while larger trolling motors feature maximum currents in the 50-60 Amps range.

Group 24 batteries are able to power 50-60 Amps motors for 35-45 minutes, depending on the current draw and exact battery model.

But, since trolling motors are rarely used at full throttle, the operating time of these batteries is usually longer.

If longer operating time is required, one may consider larger AGM batteries (that are also heavier), or perhaps even lithium trolling motor batteries (that are also more expensive, at least initially).

Group 24 Batteries as Wheelchair Batteries

vmaxtanks mr 107 w300Group 24 batteries are commonly used in the single-battery (12 volts) electric wheelchairs.

Although operating time significantly depends on the terrain and driving speed, generally, a wheelchair with 2x150 watts motors requires ~25 Amps at maximum speed.

Since the RC value of group 24 batteries is in 120-180 minutes range, such 2x150 watts wheelchair may be powered with group 24 battery for at least 2-3 hours - this also depends on the battery model.

Wheelchairs with stronger motors, for example, 2x200 watts (~34 Amps) or 2x250 watts (~42 Amps) may be powered with these batteries for 50-80 minutes, depending on the exact battery model and battery load.

But, since wheelchairs are seldom used at full power, operating times using group 24 batteries, especially those with longer RC values, is often much longer.

 How to Charge Group 24 Batteries

When charging group 24 batteries, as well as any other lead-acid batteries, it is highly recommended to use intelligent battery chargers that allow the user to set the battery type (flooded, AGM, Gel-Cell), that feature temperature compensation, battery cell equalization mode, battery analyzer and other advanced features that may significantly prolong battery life.

Most group 24 batteries feature maximum allowed charging current in the 20-25 Amps range - charging these batteries with, for example, 10 Amps chargers means that the batteries are not under stress and that 85 Ah battery discharged down to 50% DoD may be fully charged in under 5 hours.

However, if the battery is regularly discharged below 50% DoD (80-100% DoD), such a battery charger may require 7-9 hours to fully charge such battery - in that case, 12-15 Amps battery chargers are recommended.


Long Story Short: BCI Group 24 Batteries are commonly used for general purpose applications where BCI Group 31 batteries are too large and heavy, and BCI Group 34 batteries are too small to provide required performances.

Most popular group 24 batteries differ in capacity, CCA, MCA, RC and other features:

Model Battery Type Chemistry Ah CCA MCA RC Weight (lbs/kg) Review
ACDelco M24AGM Deep Cycle AGM 80 500 625 140 43.0 lbs; ~19.5 kg -
Exide Edge FP-AGM24F Dual Purpose AGM 60 710 - 120 46.2 lbs; 20.9 kg -
Lifeline GPL-24T Deep Cycle AGM 80 550 680 149 56.0 lbs; 25.5 kg -
Mighty Max ML75-12 Deep Cycle AGM 77 - - - 50.71 lbs; ~22.97 kg Mighty Max ML75-12
NorthStar NSB-AGM24F Dual Purpose AGM 76 840 1000 160 57 lbs; ~25.8 kg -
Trojan 24-Gel Deep Cycle Gel 77 - - 147 52 lbs; ~23.6 kg -
UPG UB12750 45821 Deep Cycle AGM 75 - - - 49.1 lbs; ~22.3 kg UPG UB12750
VMAXTANKS MB107-85 Deep Cycle AGM 85 - - 170 55 lbs; ~24.9 kg -
VMAXTANKS MR107-85 Deep Cycle AGM 85 - 700 160 55 lbs; ~24.9 kg -
VMAXTANKS SLR85 Deep Cycle AGM 85 - - 180 55 lbs; ~24.9 kg -
Weize FP12750 Deep Cycle AGM 75 - - - 47.2 lbs; ~21.4 kg -

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

When looking for your next group 24 battery, be sure to choose according to your own needs and requirements.

And whatever You do, stay safe.