What vehicles can the Ring ULTRABOOST start?
The RJS020 is suitable for:
Petrol engines up to 5.0L
Diesel engines up to 2.0L
Ideal for most cars, SUVs, and light commercial vehicles
Can it start a car with a completely flat battery?
Yes. The Boost function allows the jump starter to start vehicles even when the battery is fully discharged
What is peak performance?
RJS020 has 1000A peak amps
What do the lights indicate?
Red light with audio warning - Connected to the battery the wrong way around.
Flashing green light – Battery has low volage below 9V- use the boost function
Green light – connected correctly and good to jump start
No lights – Battery is below 1V. Use the boost function
Does it show how much charge is left?
Yes. A large digital LCD display clearly shows the remaining battery level, so you always know when it needs recharging
Can I use it as a power bank?
Yes. All models have a a power bank function
How do I recharge the jump starter?
Recharge via the USB‑C input using a suitable power adapter. For best performance, always fully charge the unit before use
Can it be used in cold weather?
Yes. The jump starter operates in temperatures from ‑20°C to +55°C, making it suitable for year‑round use. Charging should be done indoors within the recommended temperature range
Does it require maintenance?
No regular maintenance is required. Simply keep it charged, store it safely, and check cables and clamps before use