Rechargeable lead acid battery 4V 7.5Ah SY7.5-4 for alarms, scales and toys

Batería plomo recargable SY7.5-4 4V 7.5Ah para alarmas y juguetes vista lateral

Rechargeable lead acid battery 4V 7.5Ah SY7.5-4 for alarms, scales and toys

Name: Rechargeable lead acid battery 4V 7.5Ah SY7.5-4 for alarms, scales and toys
Brand: Songyuan
SKU: 2A130104-SY7.5-4
Price: 8.49 EUR
Availability: InStock

Brand: Songyuan

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8.49€

VAT included (Ex VAT: 6.90 €)

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Express delivery Wed, Apr 29 - Thu, Apr 30

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SY7.5-4 Rechargeable Lead Acid Battery 4V7.5Ah/20HR for Alarms, Scales and Toys

This rechargeable lead acid battery SY7.5-4 is designed to deliver reliable, long-lasting performance in multiple applications such as alarms, electronic scales and electric toys. Made with AGM technology and high-quality materials, it ensures a long service life and minimal maintenance.

Key features

Nominal voltage: 4V
Capacity: 7.5Ah (20 hours)
Type: Maintenance-free rechargeable lead-acid battery
Technology: AGM with electrolyte gel
Polarity: Positive on the right
Dimensions: 100mm x 70mm x 47mm
Weight: 0,7 kg
Initial current: less than 2.1A

Typical applications

This battery is ideal for devices that require a reliable and long-lasting power source, such as:

Security alarms and access control systems
Electronic scales
Electric toys, such as children's cars and carriers
Uninterruptible power supplies (UPS)
LED lamps, desk lamps and emergency lights
Portable electronic equipment such as fans, speakers and photographic devices
Communication systems, intercoms and automatic doors
Solar power systems and power generation

Instructions for use

The red terminal indicates the positive pole and the black terminal the negative pole, both located on the top of the battery.
The battery is factory charged and ready for immediate use.

Compatibility

Compatible with a wide range of electronic devices that require a 4V rechargeable battery with a 7.5Ah capacity, especially in alarm, scale and electric toy applications.

Advantages

Maintenance-free, thanks to AGM technology
High durability and stable performance
Easy installation and immediate use
Compact and lightweight design for various applications

Maintenance-free rechargeable lead-acid battery with AGM technology
Nominal voltage of 4V and 7.5Ah capacity for extended use
Ideal for alarms, electronic scales and electric toys
Compact dimensions: 100mm x 70mm x 47mm and lightweight at 0,7 kg
Positive on the right polarity for easy connection
Factory-charged battery ready to use
Initial current below 2.1A for safety and efficiency

Customer Questions & Answers

What advantages does the AGM technology of the SY7.5-4 battery offer over conventional lead-acid batteries?

AGM (Absorbent Glass Mat) technology provides greater resistance to electrolyte leakage, better tolerance to charge-discharge cycles and minimal maintenance compared with traditional lead-acid batteries, resulting in greater safety, reliability and service life, especially in intermittent use or backup applications.

What are the dimensions, weight and polarity of this battery's terminals?

The SY7.5-4 battery measures approximately 102 mm (length) x 70 mm (width) x 70 mm (height), weighs around 1.2 kg and uses 4.8 mm Faston terminals; the red connector indicates the positive pole (+) and the black one the negative (-).

Which types of devices and chargers is this battery compatible with, and what recommendations are there to avoid overcharging it?

It is compatible with 4 V systems requiring up to 7.5 Ah, such as alarms, scales and electric toys. We recommend using automatic AGM chargers that preferably limit the current to 0.75 A (C/10) to avoid overcharging, automatic cut-off when it reaches 4.5-4.6 V, and avoiding leaving it permanently connected to non-smart chargers.

What is the estimated service life and charge/discharge cycle count this model can withstand, and under what conditions can it be affected?

Under ideal conditions, it can complete between 200 and 300 full cycles (discharge to 100%), or up to 1,000 cycles with partial discharges (30-50%). High temperatures (>35°C), deep over-discharges and prolonged storage without recharging significantly reduce its service life.

How does this battery compare in safety with other alternatives (for example, lithium batteries) in domestic applications?

AGM lead-acid batteries such as the SY7.5-4 are inherently more tolerant of overcharging and less prone to fire or explosion than lithium batteries in the event of electrical faults, although they are heavier and offer lower energy density. They do not require maintenance or special ventilation for domestic applications, but short-circuiting the terminals should always be avoided.

What devices is this battery suitable for?

It is suitable for alarms, electronic scales, electric toys and other devices that require a 4V and 7.5Ah rechargeable battery.

Does the battery require maintenance?

No, this battery is maintenance-free thanks to its AGM technology with electrolyte gel.

How do you connect the battery correctly?

The red terminal is the positive pole and the black terminal is the negative pole, both located on the top of the battery.

Does the battery come charged and ready to use?

Yes, the battery is delivered factory charged and can be used directly by the user.

What are the battery dimensions and weight?

The dimensions are 100mm x 70mm x 47mm and it weighs approximately 0,7 kg.