Rechargeable, long-lasting, and fully compatible with all 6V construction warning lights — over 80 days of runtime, very low self-discharge, and 1,000+ charge cycles.
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Industry leaders trust AVIALP.
Fewer swaps
Depending on the model, one 4R25 battery runs for 60–100 days instead of ~20 days with a disposable 4R25 battery — reducing battery swaps by a factor of 2 to 5.
lower operating costs
In real use, one 4R25 battery replaces more than 1,000 disposable 4R25 batteries and cuts your battery costs by well over 90%.
less waste
Instead of disposing of hundreds of disposable 4R25 batteries, you use a single rechargeable 4R25 battery — reducing battery waste by more than 99% and helping protect the environment.
Longer runtime, lower costs, full compatibility.
3.6V Li-ion with BMS — stable voltage from 4.2V to 2.6V
Very low self-discharge thanks to Li-ion technology
Fully compatible with 6V construction warning lights
AVIakku 25Ah Runtime
Up to 60 days (steady-on).
Up to 120 days (flashing mode).
AVIakku 45Ah Runtime
Up to 110 days (steady-on).
Up to 220 days (steady-on).
Smart charger for the 3.6V AVIakku 4R25 (25Ah and 45Ah). Designed for maximum lifespan, safety, and efficient charging of 6V construction warning light batteries.
Charges up to 3 batteries in parallel — optimized for gentle charging
Built-in temperature monitoring — protects against overheating
Plug & play — ready to use, no separate power supply required
10h charging time for 3× 25Ah AVIakku
20h charging time for 3× 45Ah AVIakku
Our products aren’t just developed — they’re independently tested. Both the battery and the charger meet all relevant international safety and quality standards.
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AVIakku 25Ah pays for itself in about 10 months — after that, you only pay the electricity to recharge instead of constantly buying new batteries.
With up to 60+ days (25Ah) or 110+ days (45Ah) in continuous operation, AVIakku delivers class-leading runtimes. In flashing mode, runtime roughly doubles.
The BMS disconnects the AVIakku at around 2.6V — so the LED construction warning light stays bright instead of gradually dimming. This improves visibility and road safety.
AVIakku replaces hundreds of disposable 4R25 batteries, drastically reducing waste, recycling effort, and CO₂ emissions.
The “6V” on disposable 4R25 batteries is a lab rating. On site, the voltage drops sharply under load within a short time.
After only brief use, conventional 4R25 batteries drop to 4–5V, later to 3–4V, and near the end even close to 0V — with noticeably reduced performance.
That’s why construction warning lights are designed to work across a wide voltage range — otherwise disposable 6V 4R25 batteries would only be reliable at the very beginning.
The 4R25 AVIakku delivers a stable voltage from 4.2V down to 2.6V — matched to the real operating window of modern warning lights.
Why 100+ companies choose the rechargeable 4R25 battery.
Everything you need to know about the rechargeable 4R25 AVIakku.
AVIALP builds rechargeable 4R25 batteries that eliminate the hidden costs and safety risks of disposable batteries used in construction warning lights. With 2–3× longer runtime, 1,000+ charge cycles, and very low self-discharge, AVIALP delivers longer operating time, less waste, and lower total cost over time.
Request a test kit
AVIALP builds rechargeable 4R25 batteries that eliminate the hidden costs and safety risks of disposable batteries used in construction warning lights. With 2–3× longer runtime, 1,000+ charge cycles, and very low self-discharge, AVIALP delivers longer operating time, less waste, and lower total cost over time.
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