Kronobat AUX1 · Auxiliary battery 12V 35Ah 520A
Specifications
| Brand | KRONOBAT |
|---|---|
| Part number | AUX1 |
| Voltage (V) | 12 |
| Capacity (C20) | 35Ah (c20) |
| Technology | Lead-acid |
| Length | 212.00 mm |
| Width | 175.00 mm |
| Height | 140.00 mm |
| Weight | 10.75 Kgs |
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Kronobat AUX1 12V 35Ah 520A is an auxiliary battery: it supports the Start-Stop system and on-board electronics during stops, without draining the main battery.
Why this auxiliary battery?
- Designed for Start-Stopbuilt for the intensive cycling of modern cars
- 2 to 3 times longer lifevs fitting a cheap conventional battery
- Fast recoveryrecharges in minutes once the engine is running
Voltage
12 V
Capacity
35 Ah
Cold cranking
520 A
Dimensions
212×175×140 mm
Technology
Lead-acid
Polarity
Positive on the right
Weight
10,75 kg
Model
AUXILIAR
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Auxiliary battery Kronobat AUX1 Auxiliar 35Ah 520A 12V
12VVoltage
35AhCapacity
520ACold cranking
10.75kgWeight
The 12 V, 35 Ah Kronobat AUX1 auxiliary battery from the Auxiliar range with conventional lead-acid technology powers the auxiliary network of cars with advanced Start-Stop and heavy electronics. It measures 212 × 175 × 140 mm and the positive terminal on the right, the format sought by anyone replacing a 35 Ah battery in vehicles with an auxiliary battery.
- Stabilises the onboard network voltage.
- Conventional lead-acid: the most proven and economical technology.
- Maintenance-free.
- Sealed AGM: safe when installed in the cabin.
What the Kronobat AUX1 is for
As an auxiliary battery, the Kronobat AUX1 works alongside the main one; replace it when the vehicle reports a fault in the support network. Check that it matches your current battery in dimensions, terminals and hold-down: this reference has a weight of 10.75 kg and 1.0 terminals.
Will it fit your current battery tray?
It has external dimensions of 212 × 175 × 140 mm and weighs 10.75 kg. The positive terminal on the right decides which side the cables end up on: it is the detail that causes most buying mistakes, so check it before ordering. It uses 1.0 terminals, the system that anchors and connects it in the vehicle. Before replacing it, measure your current battery tray: if all three dimensions and the terminal positions match, the swap is direct and needs no adapters.
What Kronobat does differently
Kronobat is the exclusive brand of baterias.com: batteries made to the same production standards as the leading brands, with a value for money that is hard to match and an official warranty. All the Kronobat batteries in our catalogue are genuine product, recently manufactured and covered by the manufacturer's warranty.
The Kronobat AUX1: Auxiliar range and conventional lead-acid technology
The Auxiliar is the Kronobat range the AUX1 belongs to: it shares the same construction and quality criteria with the rest of the series, and varies in capacity and format to suit each vehicle.
In a conventional battery the electrolyte is liquid and the lead plates are immersed in it. It is a mature, economical and easily recycled technology, ideal for starting vehicles in normal use.
How to make it last longer
The auxiliary battery works alongside the main one: if a support-network fault warning appears, check both. On batteries with filler caps, check the electrolyte level and top up only with distilled water.
Official warranty
The Kronobat AUX1 comes with the manufacturer's official warranty against manufacturing defects. If it fails through a defect within the warranty period, we replace it at no cost to you.
Delivery times and returns
Orders placed before 6:00 pm with the battery in stock ship the same day. Delivery in mainland Spain and Portugal takes 24-48 working hours; for the Balearic and Canary Islands and the rest of the European Union allow 3 to 5 working days. You have 14 days to return an unused battery; in mainland Spain and Portugal collection is free. We email you the tracking number as soon as the parcel ships.
BCOM-KRONOBAT-AUX1
Data sheet
- Brand
- Reference
- AUX1
- Model
- AUXILIAR
- Voltage (V)
- 12
- Length
- 212.00 mm
- Width
- 175.00 mm
- Height
- 140.00 mm
- Weight
- 10.75 Kgs
- Technology
- Lead-acid
- Terminal layout
- Positive terminal on the right
- Terminal type
- 1.0
- Cold cranking amps (EN)
- 520A
- Capacity (C20)
- 35Ah (c20)
Specific References
- MPN
- AUX1
Comparison: Kronobat AUX1 vs equivalents
The Kronobat AUX1 is interchangeable with these equivalent references: AUX1 (Varta).
| Product | Specifications | Technology | Price |
|---|---|---|---|
Kronobat
AUX1
This battery
|
12V 35Ah 520A | Lead-acid | |
Varta
AUX1
|
12V 35Ah 520A | Lead-acid | €147.50 |
Equivalences verified by our technical team: same dimensions, polarity, capacity and CCA. Official manufacturer warranty on every option.
Recommended accessories
How to change the battery
Step-by-step guide to replace your car battery in 15-30 minutes (longer if the battery is under the seat or in the boot) without losing vehicle settings.
Step 1. Prepare the vehicle
Park on a flat surface, switch off the engine and remove the key. Make sure all lights and electrical accessories are off. Wait 1-2 minutes before starting.
Step 2. Locate the battery
Open the bonnet. The battery is usually in the engine bay, but in many modern cars it may be in the boot or under the passenger seat. Check the manual if you cannot find it.
Step 3. Disconnect the negative (−) terminal
Use the 10 mm wrench to loosen the negative cable nut (black, marked −) and remove the cable from the post. Move it aside so it cannot touch any bodywork.
Step 4. Disconnect the positive (+) terminal
Repeat with the positive cable (red, marked +). Important: never let a terminal touch metal of the car while the other is still connected.
Step 5. Remove the old battery
Loosen the bottom hold-down clamp with the same wrench. Lift the battery carefully (it can weigh 15-25 kg). Clean the tray with a brush and baking soda if there is corrosion.
Step 6. Install the new battery
Place the battery in the same orientation as the old one (positive terminal on the same side). Tighten the hold-down clamp firmly.
Step 7. Connect the cables
Connect the positive (+) terminal first, then the negative (−). Tighten the nuts with the wrench until each terminal does not move. Apply anti-spark grease if you have any.
Step 8. Verify the engine starts
Close the bonnet. Start the engine to confirm everything works. On cars with Start-Stop or a BMS, you may need to register the battery via OBD so the alternator applies the correct charging profile.
Frequently asked questions
How is the Kronobat AUX1 battery installed in the vehicle?
In most cars it fits in 15-30 minutes with a 10 mm wrench; if the battery is under the seat or in the boot the time can double. See the step-by-step guide on this page. Quick summary: 1) switch off the engine and remove the key; 2) locate the original battery (engine bay, boot or under seat); 3) disconnect the negative (−) terminal first, then the positive (+); 4) loosen the hold-down clamp and remove the old battery; 5) fit the new one in the same orientation — match the polarity shown on the product sheet; 6) connect the positive (+) first, then the negative (−). On cars with Start-Stop or BMS, register the battery via OBD so the alternator applies the correct charging profile.
What is the service life of the AUX1 model?
Expected lifespan of the Kronobat AUX1 is 4 to 6 years in regular car use without Start-Stop. In cold regions it drops slightly due to cold-start stress; in very hot regions it also drops because of electrolyte evaporation. To extend its life: avoid deep discharges (headlights on with engine off), have the alternator checked yearly, and keep the battery clean and properly secured.
What are the dimensions of the Kronobat AUX1 battery?
Dimensions (length × width × height) are 212×175×140 mm — also written as 212x175x140 mm — following the European DIN standard. Always measure the space in your car before buying: even one extra millimetre can prevent the hold-down clamp from closing. The height shown includes the terminals.
Is the AUX1 valid for my vehicle?
Three options to confirm: 1) enter your number plate in the finder (DGT/DVLA/KBA auto-detect your model and engine); 2) check the "Compatible vehicles" tab on this page, where we list every vehicle verified by our technical team; 3) if you cannot find your model, message us on WhatsApp with brand, model, engine and year — we reply during business hours (Mon–Fri 10:00–13:30 and 16:40–18:00 (Spanish time, CET)). The AUX1 typically fits a wide range of European vehicles thanks to its standard DIN case format.
What are the equivalents of the AUX1 model?
Directly interchangeable batteries (same dimensions, same polarity, same Ah and CCA) are the OEM equivalents from leading brands: Bosch, Tudor, Exide and, depending on the model, Banner or Yuasa. Exact equivalence depends on technology — an EFB cannot be replaced with a conventional battery in Start-Stop cars. See the "Equivalents" section to view recommended options at the same performance level.
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