12volt 45 ah Multipower Dry Battery

Description

Basic Identity & Type

• Nominal voltage: 12 volts

• Nominal capacity: 45 Ah (usually measured over 20 h discharge, sometimes denoted C20)

• Type / Chemistry: “Dry” generally means the electrolyte is immobilized (not free liquid) — often AGM (Absorbent Glass Mat) or VRLA (Valve Regulated Lead Acid).

• Sealed, maintenance-free: No topping up with water; sealed construction prevents leakage.

In the case of a Multipower MP45-12 (standard type) battery, it is an AGM sealed lead acid battery. Accu-24+2B2B Online Shop+2

Construction & Physical Properties

• Electrolyte form: Electrolyte is absorbed into glass‐fibre mats, so no free liquid.

• Enclosure: Shock and break resistant, sealed housing, flame-retardant casing.

• Self-discharge: Low rate of self-discharge when idle.

• Weight: Around 14 kg (for some Multipower models)

• Dimensions & terminals: For MP45-12, dimensions about 198 × 166 × 171 mm (L×W×H) and terminals M6 thread.

• Maximum short burst current: In MP45-12 spec, up to around 540 A for 5 seconds.

Electrical Characteristics & Performance

• Nominal capacity: 45 Ah at 20 h rate (i.e. 2.25 A discharge for 20 hours until end voltage)

• End‐of‐discharge voltage: Typically around 10.5 V (for lead acid)

• Recommended charging voltage (float / cyclic): Typical AGM lead acid charge regimes might be ~13.5-13.8 V (float) and ~14.4-14.6 V (cyclic) (this depends on the manufacturer’s spec)

• Charge efficiency: Relatively high (but some loss as heat)

• Cycle life: Depends heavily on depth of discharge; shallower cycles yield more life

• Operating temperature range: Usually specified; good performance in moderate temperature range, but reduced capacity at low temperatures

• Discharge characteristics: The battery can deliver higher currents for short periods; good for use in UPS, emergency power, alarm systems, etc.

Applications

Such a 12 V 45 Ah sealed “dry/AGM” battery is used in:

• UPS / backup power systems

• Alarm / fire alarm systems

• Emergency lighting

• Telecom / network backup systems

• Medical equipment

• Solar / off‐grid systems (in smaller setups)

• Leisure / camping / caravans (for 12 V loads)

Indeed, the Multipower MP45-12 is marketed for use in alarm & fire systems, emergency power, medical, hobby, industry. Accu-24

Advantages & Limitations

Advantages:

• Maintenance free (no topping up)

• Sealed, safe installation (less risk of acid leakage)

• Good performance and reliable in standby / cyclic applications

• Relatively robust (shock, vibration tolerant)

Limitations / considerations:

• Sensitive to overcharging / undercharging

• Heat reduces lifespan

• Heavy for its size compared to more modern chemistries (e.g. Li‐ion)

• Capacity drops at low temperature

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