Deep Cycle Marine Battery

Best BCI Group 22NF Battery

BCI Group 22NF batteries are very popular, mid-size, general-purpose batteries, commonly used as wheelchair batteries, trolling batteries, as a second car deep cycle battery, as small inverter battery, in medical and security applications, etc.

BCI Group 22NF batteries are mostly spill-proof AGM and Gel-Cell lead-acid batteries, although lithium Group 22NF batteries have started to appear on the market as well.

Published: June 2, 2021.

weize lfp1255

BCI Group 22NF Batteries Features and Specifications

BCI Group 22NF batteries feature physical dimensions of (L x W x H) 9 7/16 x 5 1/2 x 8 15/16 inches (240 x 140 x 227 mm) and a positive terminal on the left side of the battery.

Note: BCI Groups 51 and 51R feature very similar dimensions of 9 3/8 x 5 1/16 x 8 13/16 inches (238 x 129 x 223 mm) - some manufactures even label their batteries as Group 51 or Group 51R, although their batteries actually belong to the group 22NF.

xs power d5100r xs

Wet/flooded group 22NF batteries are not very common on the market and are being phased out by Absorbent Glass Mat (AGM) and Gel-Cell batteries which are generally spill-proof and maintenance-free batteries.

On average, group 22NF batteries feature a nominal capacity of 55-60 Ah, a nominal voltage of 12 volts, and an RC value in the 100 - 135 minutes range.

Lead-acid group 22NF batteries weigh ~35-45 pounds, while lithium group 22NF batteries weigh less, usually between 14 and 18 pounds.

The following comparison chart lists some of the most popular BCI Group 22NF batteries with their most important features and specifications:

Model Battery Type Cell Type Ah CCA MCA RC Weight (lbs/kg) Review
Casil CA12550 Deep Cycle AGM 55 - - - 35 lbs; 15.9 kg -
ExpertPower EXP12500 Deep Cycle AGM 55 - - - 36.0 lbs; 16.3 kg -
Mighty Max ML55-12 Deep Cycle AGM 58 - - - 37.0 lbs; 16.8 kg Mighty Max ML55-12
PowerSonic PS-12550 Deep Cycle AGM 55 - - - 36.0 lbs; 16.3 kg -
UPG UB12550 AGM Deep Cycle AGM 55 - - - 45 lbs; 20.4 kg -
UPG UB12550 Gel Deep Cycle Gel-Cell 55 - - - 38.6 lbs; 17.5 kg -
VMAXTANKS LFP22-1255 Deep Cycle LiFePO4 55 - - 120+ 15.5 lbs; 7.1 kg -
VMAXTANKS MB96-60 Deep Cycle AGM 60 - - 125 43 lbs; 19.5 kg -
VMAXTANKS SLR60 Deep Cycle AGM 60 - - 135 43 lbs; 19.5 kg -
Weize LFP1255 Deep Cycle AGM 55/10h - - - 34.2 lbs; 15.5 kg -
XS Power D5100 XS Dual Purpose AGM 60 - 745 131 43.2 lbs; 19.6 kg -
XS Power D5100R XS Dual Purpose AGM 60 - 745 131 43.2; 19.6 kg -

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

Lithium group 22NF batteries are not as common as AGM batteries, they cost more, sometimes much more than lead-acid batteries, but they offer great weight savings, especially when discharged with currents in the 30-50 Amps range, they support much more deep discharge cycles (8-12x more!) and are protected by the built-in Battery Management Systems (BMS).

vmax lfp22 1255 battery

In the long run, lithium 22NF batteries are actually cheaper than lead-acid batteries and are recommended for cycling applications.

If You are looking for a standby battery, consider a good AGM 22NF battery, especially if there are no issues due to the battery weight.

How to Charge Group 22NF Batteries?

When the group 22NF batteries are part of an electric system that features a battery charger intended for such battery, let that battery charger charge the battery - this is a typical example of a 22NF battery installed in the lawn tractor, power generator, small boat, wheelchair and similar.

When the group 22NF lead-acid batteries are charged using battery chargers, intelligent battery chargers with temperature sensors are recommended - they analyze the battery first and only then charge it according to the battery type (set by the user - wet/flooded, AGM, Gel-Cell), battery condition, current charge levels, etc.

Most group 22NF lead-acid batteries can accept charging currents up to 15-18 Amps. Just to be sure, intelligent battery chargers with a maximum charging current of up to ~10 Amps are recommended.

Such battery chargers can recharge lead-acid 22NF battery discharged down to 50% DoD in ~3 hours and if required, most such chargers can automatically switch to desulphation, equalization, and maintenance charging modes.

Lithium group 22NF batteries should be recharged using dedicated lithium battery chargers or with smart AGM battery chargers that feature dedicated lithium battery charging mode - lithium batteries require Constant Current/Constant Voltage (CC/CV) battery chargers and most AGM battery chargers cannot fully recharge them, while AGM battery chargers with desulphation mode can even damage the lithium batteries.

Group 22NF Batteries as Wheelchair Batteries?

Group 22NF batteries are very often used as wheelchair batteries, either one or two (connected in parallel) batteries for 12V electric systems or two batteries connected in series for 24V electric systems.

For example, when the single Mighty Max ML55-12 is used to power a 2x250W wheelchair, the new, fully charged ML55-12 battery can provide ~500W for 45 minutes down to 10.5 volts, which is a very nice result for 37 lbs AGM battery.

If two such batteries are used to power the very same wheelchair, they can provide 500W for almost two hours, with a weight penalty of 74 pounds.

Lithium VMAX LFP22-1255 can provide 500W for 70+ minutes and it weighs just 15.5 pounds (25+ more minutes, 21.5 pounds less).

And yes, it costs more, dedicated lithium battery charger is recommended and supports 4000+ cycles down to 90% DoD and 6000+ cycles down to 80% DoD.

mighty max ml55 12

Group 22NF Batteries as Inverter Batteries

When being off-the-line, group 22NF batteries may be connected to power inverters and used to power home appliances, tools, toys, multimedia devices, and similar.

When calculating how long the battery can last when powering the power inverter, one must calculate using the inverter input power and NOT inverter output power.

For example, a power inverter that provides 400 Watts with an efficiency of 80% requires 500 Watts input.

Pinp = Pout / Efficiency% = 400 Watts / 0.8 = 500 Watts

Most AGM group 22NF batteries can provide 500W for ~40-50 minutes, but if the load is kept to just one-third (~167 Watts), then the 22NF batteries can provide ~3 hours of power.

Maybe that 167 Watts doesn't sound much, but a good 32" TV requires 40-75 Watts, type-dependent.


Long Story Short: Most group 22NF batteries are spill-proof, maintenance-free AGM batteries, suitable for float/standby and cyclic applications.

As such, group 22NF batteries are very common batteries, just a fraction larger than 51/51R batteries, and can be ordered from various online shops or they can be found in the local hardware stores.



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