R&B 074601 - Maintenance-free lead-acid battery 4V / 3.5Ah (AGM)
Product information
The R&B 074601 lead-acid battery (4V / 3.5Ah) is a compact and extremely reliable energy storage unit for small devices. Thanks to the proven AGM technology (Absorbent Glass Mat), where the battery acid is safely bound in a glass fibre mat, this lead-acid battery operates completely maintenance-free and is absolutely leak-proof.
With its nominal voltage of 4 volts and a capacity of 3.5 ampere-hours, it is the perfect replacement part to restore ageing everyday devices to full performance and long operating times. Its sturdy plastic case reliably protects the cells from shocks and vibrations.
Highlights at a glance
- Maintenance-free (VRLA): No distilled water needs to be refilled during the entire service life.
- Leak-proof & position-independent: Thanks to the AGM mat technology, the battery can be operated in almost any position (except permanently upside down).
- Low self-discharge: Maintains voltage steadily even during longer storage without constant recharging.
- Rugged case: The impact-resistant ABS plastic protects the battery from mechanical damage.
- No memory effect: The lead-acid technology allows intermediate charging at any time without the capacity permanently shrinking.
Areas of application
- Hand spotlights & work lights
- Serves as a precisely fitting replacement battery for many classic halogen or LED battery spotlights that require a 4V power supply.
- Commercial & Private Scales
- The standard energy storage for mobile platform scales, counting scales or market scales (e.g. from KERN or comparable manufacturers).
- Insect killers & camping accessories
- Provides long-lasting power in portable electric fly swatters, lanterns or small fans.
- Emergency power & alarm technology
- Is often used as a backup battery in small emergency lighting or self-sufficient security systems.
Installation & Safety instructions
- The correct charger
- Only ever use chargers that are explicitly approved for 4 volt lead-acid batteries. A 6V or 12V charger would destroy the battery immediately and entails a fire risk.
- Avoid deep discharge
- Lead-acid batteries do not tolerate complete discharge (deep discharge). Recharge the device promptly after every prolonged use to prevent harmful sulphation of the lead plates.
- Observe polarity
- Make sure you connect the cable lugs with the correct polarity: Red is plus (+), black is minus (−).
- Professional disposal
- Lead-acid batteries contain toxic heavy metals and must not be disposed of with household waste. Hand in the old battery free of charge to a retailer or at a local recycling centre.
Features
| Model / Article number | R&B 074601 |
| Technology | **VRLA / AGM** (lead-fleece) |
| Nominal voltage | **4.0 V** |
| Nominal capacity | **3.5 Ah** (3500 mAh) |
| End of charge voltage | 4.8 V - 5.0 V (Cycle use) |
| Connection type | **Faston 187** (4.8 mm plug connection) |
| Dimensions (L x W x H) | **90 x 34 x 60 mm** (height without contacts) |
| Total height | approx. 66 mm |
| Weight | approx. 0.43 kg |
| Service life | up to 5 years (standby use) |
FAQs about the R&B 074601 (4V/3.5Ah)
My old battery is 4V and 4Ah or 4.5Ah. Can I still use this 3.5Ah battery?
Yes, usually without any problem. The voltage (4V) must be strictly adhered to, but the ampere-hours (Ah) only indicate the "capacity". A 3.5Ah battery fits electrically perfectly, it merely provides a minimally shorter total runtime compared to a 4.5Ah battery. It is only important that the dimensions fit into your device's battery compartment.
Do I need to charge the battery before first use?
It is highly recommended. Although AGM batteries are supplied pre-charged from the factory, they can lose some voltage during storage. Full charging before first use ensures you get full performance and protects the cell chemistry.
Can I replace this lead battery with a modern lithium-ion one?
This is strongly discouraged. Lithium-ion batteries have a different voltage (usually 3.7V) and require completely different charging electronics. If you connect a Li-ion battery to the internal charging electronics for lead-acid batteries in your device, there is an acute risk of fire and explosion.| Capacity: | 3.4Ah |
|---|---|
| Tension: | 4V |
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