--- product_id: 457735247 title: "Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green" brand: "tecmate" price: "€ 320.26" currency: EUR in_stock: true category: "Tecmate" url: https://www.desertcart.gr/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v store_origin: GR region: Greece --- # 6A high current charge 10-step advanced charging BMS battery protection Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green **Brand:** tecmate **Price:** € 320.26 **Availability:** βœ… In Stock ## Summary > πŸ”‹ Charge smarter, last longer β€” never miss a beat with Tecmate OptiMate Lithium 4s! ## Quick Answers - **What is this?** Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green by tecmate - **How much does it cost?** € 320.26 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.gr](https://www.desertcart.gr/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v) ## Best For - tecmate enthusiasts ## Why This Product - Trusted tecmate brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **BMS Wake-Up Mode:** Safely revive batteries with integrated Battery Management System protection from sleep mode. - β€’ **10-Step Smart Charging:** Experience the most advanced battery-saving program that optimizes every stage of charging. - β€’ **Weatherproof & Compact:** Durable, lightweight design with included weatherproof leads for reliable outdoor use. - β€’ **Power-Packed 6A Current:** Charge your lithium battery faster and more efficiently with a robust 6-amp output. - β€’ **TUNE Mode for ECU Stability:** Maintain stable battery support during critical ECU programming sessions. ## Overview The Tecmate OptiMate Lithium 4s 6A TM391 is a cutting-edge 12.8V lithium battery charger and maintainer featuring a powerful 6A output, an advanced 10-step charging program, and integrated BMS wake-up mode. Designed for high-performance LiFePO4 batteries, it ensures optimal battery health and stability, including a specialized TUNE mode for ECU programming. Compact, weatherproof, and backed by a 3-year warranty, it’s the ultimate tool for professionals who demand reliable, expert battery care. ## Description Buy Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green: Battery Chargers - desertcart.com βœ“ FREE DELIVERY possible on eligible purchases ## Features - More charging power and current at 6A! - Ultimate protection for your high performance Lithium (LiFePO4 / LiFe / LFP) battery. - Most advanced 10-step charging and battery saving program. - BMS (Battery Management System) wake up mode safely wakes battery with integrated BMS protection out of sleep mode. - TUNE mode provides stable battery support during ECU programming. ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B09Z71LQF9 | | Amperage | 0.76 Amps | | Best Sellers Rank | #405,950 in Automotive ( See Top 100 in Automotive ) #1,071 in Battery Chargers | | Brand | Tecmate | | Built-In Media | Battery Charger, weatherproof battery lead & battery clip set | | Color | ['Blue'] | | Current Rating | 6 Amps | | Customer Reviews | 4.8 4.8 out of 5 stars (42) | | Input Voltage | 240 Volts | | Item Type Name | Battery Charger | | Item Weight | 9.6 Ounces | | Manufacturer | TecMate | | Mfr Part Number | TM391 | | Model Number | TM391 | | Number of Ports | 1 | | Output Voltage | 12.8 Volts (DC) | | Specification Met | ecu | | Unit Count | 1.0 Count | | Warranty Description | 3 YEAR LIMITED WARRANTY | ## Product Details - **Brand:** Tecmate - **Color:** ['Blue'] - **Item Weight:** 9.6 Ounces - **Output Voltage:** 12.8 Volts (DC) - **Specification Met:** ecu ## Images ![Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Image 1](https://m.media-amazon.com/images/I/81HNmmJBZrL.jpg) ![Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Image 2](https://m.media-amazon.com/images/I/814g4VWCKJL.jpg) ![Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Image 3](https://m.media-amazon.com/images/I/81z2yfw6OuL.jpg) ![Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Image 4](https://m.media-amazon.com/images/I/81-2JDpCQvL.jpg) ![Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Image 5](https://m.media-amazon.com/images/I/81-PLkK2Z3L.jpg) ## Frequently Bought Together - Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green - Optimate cable O-127 ring terminal harness with integrated battery status / charge system monitor, 12.8V / 13.2V lithium powersport, smart --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.gr/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v](https://www.desertcart.gr/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v) --- *Product available on Desertcart Greece* *Store origin: GR* *Last updated: 2026-07-17*