ExpertPower EXP1270 12V 7 Ah SLA AGM Battery

ExpertPower EXP1270 is sealed lead-acid (SLA) battery that uses absorbent glass mat (AGM) as separator.
ExpertPower EXP1270 is very popular battery in its class, featuring 12V nominal voltage, 7 Ah capacity, F1 terminals, very good discharging characteristics, non-spillable maintenance-free design, low self-discharge etc.

ExpertPower EXP1270 is one of the most popular batteries in its class, and is commonly used for both stand-by cyclic use in alarm and other security systems, UPS devices, toys, medical equipment, as popular small fish finder battery etc.

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ExpertPower EXP1270 Features and Specifications

ExpertPower EXP1270 physical dimensions (HxLxW) are 3.70 x 5.94 x 2.56 inches (~9.4 x 15.1 x 6.5 cm) and it weighs 4.52 pounds (~2.05 kg).

ExpertPower EXP1270 uses F1 terminals.Also, fully charged battery has on average internal resistance of 35 mΩ and self-discharge rate of 3% per month - all at 25°C (77°F).

Nominal capacity is 12V and nominal capacity is 7 Ah. When being discharged faster, its nominal capacity decreases:

Capacity (25°C, 77°F) 20h (0.35 A, 10.5V) 10h (0.663 A, 10.5V) 5h (1.19 A, 10.5V) 1h (4.05 A, 10.5V)
7.00 Ah 6.63 Ah 5.95 Ah 4.05 Ah

Since it is lead-acid battery, its capacity is also affected by the temperature:

Nominal Capacity 40°C 25°C 0°C -15°C
102% 100% 85% 65%

Note that as the discharge temperature is increased, so is the number of charging/discharging cycles that the battery can withstand decreased.

When used in stand-by applications, its life is 3-5 years. When used as deep cycle battery, its life depends on the number of charge/discharge cycles, temperature and the depth of discharge.

Depending on the Depth of Discharge (DoD) at 25°C, ExperPower Exp1270 has service life of:

- 100% DoD: 180-200 cycles (capacity loss down to 80% of nominal capacity),

- 50% DoD: 330-420 cycles (capacity loss down to 80% of nominal capacity),

- 30% DoD: 780-920 cycles (capacity loss down to 80% of nominal capacity).

Usually, when the battery capacity drops down to 80% of the capacity of the new battery, it should be recycled. However, some users continue to use it until the capacity is down to 60-70% of the nominal capacity - in that case, number of charging/discharging cycles is even larger.

Note: old ExperPower Exp1270 should be recycled - lead-acid batteries are almost 100% recyclable and they contain lead which is not environment friendly metal.

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ExpertPower EXP1270 AGM SLA Battery Discharging Characteristics

The following chart lists constant current discharge features of the new ExpertPower EXP1270 battery at 25°C (77°F) in Amps:

Voltage/Time 5 min 10 min 15 min 30 min 1 hr 2 hr 3 hr 4 hr 5 hr 6 hr 10 hr 20 hr
1.85 V/Cell 18.30 13.05 10.00 6.62 3.90 2.28 1.74 1.38 1.146 0.979 0.639 0.337
1.80 V/Cell 18.64 13.30 10.19 6.75 3.98 2.32 1.77 1.406 1.168 0.998 0.651 0.344
1.75 V/Cell 18.99 13.55 10.39 6.88 4.05 2.37 1.80 1.432 1.190 1.017 0.663 0.350
1.70 V/Cell 20.70 14.36 11.01 7.15 4.12 2.41 1.83 1.458 1.211 1.034 0.675 0.356
1.67 V/Cell 22.79 15.58 11.94 7.55 4.17 2.44 1.85 1.473 1.224 1.045 0.682 0.360
1.60 V/Cell 24.69 16.39 12.57 7.87 4.21 2.46 1.87 1.489 1.237 1.057 0.689 0.364

1.75 V per cell is equal to 10.5 V of the 6-cells battery and discharging the battery less than 10.5 volts can significantly shorter its service life.

 The following chart lists constant power discharge characteristics of the new ExpertPower EXP1270 battery at 25°C (77°F) in watts:

Voltage/Time 5 min 10 min 15 min 30 min 1 hr 2 hr 3 hr 4 hr 5 hr 6 hr 10 hr 20 hr
1.85 V/Cell 35.68 25.44 19.51 12.92 7.61 4.45 3.38 2.69 2.23 1.91 1.25 0.66
1.80 V/Cell 36.36 25.93 19.88 13.16 7.76 4.53 3.45 2.74 2.28 1.95 1.27 0.67
1.75 V/Cell 37.04 26.41 20.25 13.41 7.90 4.62 3.51 2.79 2.32 1.98 1.29 0.68
1.70 V/Cell 40.37 28.00 21.47 13.94 8.04 4.70 3.58 2.84 2.36 2.02 1.32 0.69
1.67 V/Cell 44.45 30.37 23.29 14.72 8.13 4.75 3.61 2.87 2.39 2.04 1.33 0.70
1.60 V/Cell 48.15 31.96 24.51 15.35 8.22 4.80 3.65 2.90 2.41 2.06 1.34 0.71

For example, when the battery is discharged for 20 hours, down to 1.75 volts per cell (10.50 volts total), new, fully charged battery is capable of providing 4.08 (6 x 0.68) watts of constant power.

ExpertPower EXP1270 as Fish Finder Battery?

ExpertPower EXP1270 is very often used as lightweight and cheap fish finder battery.

Operating time depends on many factors, but new fully-charged EXP1270 battery, when being discharged down to 10.5 volts can power 1.5 Amps fish finder for 3+ hours and smaller 0.5 Amps fish finder for 10+ hours.

Since EXP1270 can be easily recharged in 4-5 hours, or over night, it is common choice for fish finder battery on smaller boats, rafts and even kayaks.

ExpertPower EXP1270 vs. ExpertPower EXP1272

ExpertPower EXP1270 and ExpertPower EXP1272 are two very similar SLA AGM batteries, differing in terminals and capacity.

f1 vs f2

ExpertPower EXP1270 battery uses F1 terminals, while ExpertPower EXP1272 battery uses F2 terminals. F1 and F2 terminals are very similar, but they differ in physical dimensions and they are not 100% interchangeable.

Also, there is slight difference in capacity, with ExpertPower EXP1270 having nominal capacity (20h, 25°C, 77°F) of 7.0 Ah and ExpertPower EXP1272 having nominal capacity (20h, 25°C, 77°F) of 7.2 Ah.


Long Story Short: ExpertPower EXP1270 is very popular and affordable SLA AGM battery, and is being used for different purposes. It has proven its worth countless times and that is the reason why it is so popular.

For more reviews and recommendations, check ExpertPower EXP1270 and ExpertPower EXP1272 Amazon links (links open in the new windows).