R&B 074601 - Maintenance-free lead-acid battery 4V / 3.5Ah (AGM)

The R&B 074601 lead-acid battery (4V / 3.5Ah) is a compact and extremely reliable energy storage unit for small devices. Thanks to proven AGM technology (Absorbent Glass Mat), in which the battery acid is securely bound in a glass fibre mat, this lead-acid battery operates completely maintenance-free and absolutely leak-proof.

With its rated voltage of 4 volts and a capacity of 3.5 ampere hours, it is the perfect replacement part to help ageing everyday appliances regain their full performance and long operating times. Its robust plastic housing reliably protects the cells from shocks and vibrations.

Highlights at a glance

• Maintenance-free (VRLA): There is no need to refill with distilled water during the entire service life.
• Leak-proof & position-independent: Thanks to AGM mat technology, the battery can be operated in almost any position (except permanently upside down).
• Low self-discharge: Keeps the voltage stable even during long periods of storage without constant recharging.
• Robust housing: The impact-resistant ABS plastic protects the battery from mechanical damage.
• No memory effect: Lead technology allows intermediate charging at any time, without the capacity permanently shrinking.

Areas of application

• Hand-held spotlights & work lights
  • Serves as a precisely fitting replacement battery for many classic halogen or LED rechargeable spotlights requiring a 4V power supply.
• Commercial & private scales
  • The standard energy store for mobile platform scales, counting scales or market scales (e.g. from KERN or similar manufacturers).
• Insect killers & camping equipment
  • Provides long-lasting energy in portable electric fly swatters, lanterns or small fans.
• Emergency power & alarm technology
  • Is often used as a buffer battery in small emergency lighting or autonomous security systems.

Installation & safety instructions

• The right charger
  • Only use chargers that are expressly approved for 4 Volt lead-acid batteries. A 6V or 12V charger would immediately destroy the battery and poses a fire risk.
• Avoid deep discharge
  • Lead-acid batteries do not tolerate full discharge (deep discharge). Recharge the device promptly after each extended use to prevent damaging sulphation of the lead plates.
• Observe polarity
  • When connecting the spade connectors, always ensure the correct polarity: red is plus (+), black is minus (-).
• Proper disposal
  • Lead-acid batteries contain toxic heavy metals and must not be disposed of in household waste. Take the old battery to a retailer or the local recycling centre free of charge.

Features

FAQs about the R&B 074601 (4V/3.5Ah)

My old battery has 4V and 4Ah or 4.5Ah. Can I still use this 3.5Ah battery?

Yes, usually without any problems. The voltage (4V) must be strictly observed, but the ampere hours (Ah) only indicate the "tank size". A 3.5Ah battery fits electrically perfectly, it only delivers a minimally shorter total operating time compared to a 4.5Ah battery. The important thing is only that the dimensions fit into the battery compartment of your device.

Do I have to charge the battery before first use?

It is highly recommended. Although AGM batteries come pre-charged from the factory, they may lose some voltage during storage. A full charge before first use guarantees you full performance and protects the cell chemistry.

Can I replace this lead-acid battery with a modern lithium-ion battery?