# Battery Charger / Rectifier QOLTEC A31D — Smart charger for 12V and 24V vehicle batteries

**URL:** https://aio.lv/en/product--qoltec-a31d--12371211
**Data updated:** 2026-04-26 20:44 (EEST)
**Category:** Car Chargers & Jump Starters
**Manufacturer:** QOLTEC
**Manufacturer code:** A31D
**EAN:** 5904100214839
**Warranty:** 2 Years
**Availability:** Available for order
**Price:** 43.49 €
**Prices and availability valid until:** 2026-07-05 23:59
**Price without VAT (21%):** 35.94 EUR
**Can be purchased by legal entities:** Yes (invoice)
**Buy:** https://aio.lv/en/product--qoltec-a31d--12371211

## Delivery options

| Delivery method | Delivery time | Cost |
|---|---|---|
| Office pickup (2b. Kengaraga str., Riga, Latvia, LV-1063) | 26.06.2026 | free |
| Pickup points | 01.07.2026 | 1.99 EUR |
| Courier delivery to door | 01.07.2026 | 4.99 EUR |

## Summary description

QOLTEC A31D is a smart battery charger and rectifier designed for 12V and 24V vehicle batteries. It provides automatic charging management with functions typical for intelligent chargers (battery detection, charge regulation and maintenance). Suitable for cars, vans and other vehicles with lead-acid-type batteries, it helps maintain battery health and ensure reliable engine starts.

## Long description

QOLTEC A31D is a smart battery charger and rectifier designed for 12V and 24V vehicle batteries. It performs automatic battery detection, regulates charging current and voltage, and offers maintenance mode to keep lead-acid type batteries at optimal state of charge. The unit is intended for use with car and van batteries and fits applications where controlled charging, desulfation and long-term battery maintenance are required to support reliable engine starts.
Advantages
The charger provides automatic voltage selection between 12V and 24V and includes charge regulation that adjusts output to battery condition. Integrated maintenance mode prevents overcharging during long-term connection while trickle charging maintains capacity. The device includes protections against short circuits, reverse polarity and overheating, delivering safer, hands-off charging. Compact form factor and clear status indication make monitoring simple during the charging cycle.
Suitable for
Charging and maintaining 12V and 24V lead-acid vehicle batteries (flooded, AGM, GEL)
Routine battery maintenance for cars, vans and light commercial vehicles
Desulfation and recovery attempts for partially discharged batteries
Workshops and home garages that require an automatic, compact charger
When it may not be suitable
This charger is intended for lead-acid type batteries and may not be compatible with some newer battery chemistries such as lithium-ion unless explicitly supported by the battery manufacturer. It is not a substitute for a dedicated high-capacity starter booster when attempting to start a vehicle with a deeply discharged battery.
Key specifications
Supported battery voltages: 12 V and 24 V
Battery types: lead-acid variants including flooded, AGM and GEL
Automatic battery detection and charge regulation
Maintenance (float/trickle) charging mode for long-term connection
Protections: reverse polarity detection, short-circuit protection, thermal protection
Compact housing with status indication LEDs
How to use
Connect the charger to the battery following the polarity markings: red clamp to positive and black clamp to negative. Power the charger from the mains and allow the unit to detect battery voltage automatically; the charger will select the appropriate 12V or 24V mode and start the charging sequence. Monitor the status LEDs to confirm charging phases and wait until the charger switches to maintenance mode for long-term connection. Disconnect the charger after the maintenance or when the vehicle is ready to be used.
What to consider before purchase
Confirm your vehicle battery type is a lead-acid chemistry supported by the charger (flooded, AGM, GEL)
Ensure the charger’s supported voltages (12 V / 24 V) match your vehicle electrical system
Assess whether you need a charger with starter-boost capability if frequent jump-starts are required
Check available mains voltage compatibility and local plug type
Usage recommendations
For safe and effective charging, use the charger in a well-ventilated area, avoid charging in direct rain, and follow battery manufacturer guidelines. Regularly use the maintenance mode to prevent sulphation on vehicles that are stored for extended periods.

## FAQ

### How much does the QOLTEC A31D Battery Charger 12V/24V cost, and is it available for purchase?

The price is 43.49 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

### If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 26.06.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

### What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

### Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

### What is the warranty period?

All QOLTEC products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized QOLTEC service centers and through AiO.lv

### Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

### Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. More information about warranty service: https://aio.lv/en/warranty

## Image

https://aio.lv/img/cache/product/12371211/68520890_large.webp