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31M-825 12V105AH BCI Dual-Purpose Marine Battery

Product Description

Model: 31M-825
BRAVA 31M-825 BCI Group 31M Dual Purpose AGM Battery, Starter & Deep Cycle Sealed Marine & RV Battery.

Voltage : 12v
Capacity : 105Ah
Size : 330*173*212*237mm
Weight : 30.6kg
Terminal : 12

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31M-825 Physical Specification (mm)

Model 31M-825
Nominal Voltage 12V
Nominal Capacity(20HR) 105Ah
Dimension Length 330±2mm(12.99inches)
Width 173±2mm(6.81inches)
Container Height 212±2mm(8.35inches)
Total Height(with Terminal) 237±2mm(9.33inches)
Weight With Acid Approx 30.6Kg(67.47lbs)
Acid 1.280±0.015g/cm (25ºC)
Standard Terminal 12
Cell layout 1
Hold-Down B0
Case Black-Material (PP)
Cover Black-Material (PP)
Handle Black-Material (PP)

Electrical Specification

Rated Capacity @20 hour rate(5.25A) 105Ah
Reserve Capacity (RC) [email protected] 200min
Cold Cranking Amps(CCA) @0 ºF (-18 ºC) 825A

Standard Terminal (mm)

Terminal Type D
Positive Negative
1 19.5 17.9
31M-825 layout
31M-825 layout

31M-825 Discharge Characteristics

31M-825 Discharge Characteristics

Wet Starter Dual Purpose AGM Battery BCI Standard Series

Model Rated Voltage(V) 20hr @1.75V/cell RC (min) CCA -18℃(A) L(mm) +0/-2 W(mm) +0/-2 H(mm) +0/-3 TH(mm) +0/-3 Gross Weight(kg) Cell layout Terminal Hold-Down Handle
24M-550 12 79 150 550 260 168 208±2 233±2 23.0 1 12 B0 TS7
27M-580 12 92 175 580 306 168 208±2 233±2 27.0 1 12 B0 TS7
27M-700 12 92 200 800 306 168 208±2 231.5±2 28.5 1 12 B0 TS7
31M-720 12 105 200 720 330 173 212±2 235.5±2 29.8 1 12 B0 TS7
31M-825 12 105 200 825 330 173 212±2 235.5±2 30.6 1 12 B0 TS7
34M-800 12 62 125 800 275 171 200±2 235.5±2 21.6 1 12 B0 TS7
S34B20R 12 27 47 270 197 128 227 227 10.5 1 12 B0 TS7
S46B24R 12 45 68 325 238 128 227 227 13.5 1 12 B0 TS7
S55D23R 12 50 85 550 220 170 225 225 15.1 1 12 B0 TS7
S65D26L 12 68 125 400 257 171 227 227 17.3 1 12 B0 TS7
S75D31L 12 80 125 510 304 171 227 227 20.7 1 12 B0 TS7

FAQ

1. 31M-825 AGM Battery for Marine & RV Application

  • Up to twice the life of a standard flooded battery.
  • A starting power at low state of charge and low temperature.
  • Longer life in high temperature environments.
  • Spill proof which allows it to be mounted anywhere.
  • Maintenance free and vibration resistant.
  • Faster recharge and more cycles.

2.  How to extend the life of a SMF battery?

In order to increase the life of battery, it is necessary to monitor the battery performance constantly. Here are some tips to optimize the battery performance.
1. The SMF battery should be placed in well ventilated area to avoid high temperature environment. With each 10 degree rise in air temperature, the float life reduces to half. If the battery is installed in equipment, it is necessary to isolate it from heat generating components like transformer.
2. In order to prevent deep discharge, it is necessary to set the cut off voltage to 11.5 volts in 12 volt battery and 4.5 in 6 volt battery.
3. It is necessary to prevent no load battery drain. The additional components of the equipment such as sensors, displays and indicators consume power in the no load condition. So if the equipment is not provided with automatic charging, this power loss leads to deep discharge.4. Boost cum float charging is suitable for SMF battery. If the power failure is frequent, the battery should be charged immediately to acquire full charge before the next power failure.

5. If there is any problem such as low backup time, battery heating, low terminal voltage even after continuous charging develops, the battery should be attended immediately.

6. If the equipment is not using for long time, it should be charged once in every week. If the battery is allowed to charge and discharge frequently, its life can be extended to 3-5 years.

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