--- 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: "£140.33" currency: GBP in_stock: true reviews_count: 8 category: "Tecmate" url: https://www.desertcart.co.uk/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v store_origin: GB region: United Kingdom --- # 6A high current power 10-step advanced charging Integrated BMS protection Tecmate OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green **Brand:** tecmate **Price:** £140.33 **Availability:** ✅ In Stock ## Summary > ⚡ Charge like a pro, power your future. ## 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?** £140.33 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/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 - • **BMS Wake-Up Mode:** Safely revive batteries with integrated Battery Management System wake-up, ensuring longevity and reliability. - • **Weatherproof & Ready:** Built tough with weatherproof leads and clips, perfect for professional-grade battery management anywhere. - • **Power-Packed 6A Output:** Charge faster and smarter with a robust 6 Amp current designed for high-performance Lithium batteries. - • **TUNE Mode for ECU Stability:** Maintain stable battery support during critical ECU programming sessions without interruptions. - • **10-Step Intelligent Charging:** Experience the most advanced battery care with a precision 10-step charging and maintenance program. ## Overview The Tecmate OptiMate TM391 is a cutting-edge 12.8V, 6A lithium battery charger and maintainer featuring a sophisticated 10-step charging program, integrated BMS wake-up mode, and a specialized TUNE mode for ECU programming. Designed for high-performance LiFePO4/LiFe/LFP batteries, it offers robust, weatherproof hardware and a 3-year warranty, making it the ultimate choice for professionals demanding reliable, efficient 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 ✓ FREE DELIVERY possible on eligible purchases Review: Excellent - Works flawlessly with my EarthX batteries. A serious charger for the new world of Li batteries. Very robust, you get what you pay for. I would recommend to people I know but I'm the only one with the lithium batteries. Review: Recommended for EarthX Lithium batteries - Very nice system. Recommended for EarthX batteries. Instructions could be a little clearer. The thing I like is you can permanent leads that can be installed on the battery. This allows you to manage the battery from a location without direct access to the battery. ## 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 | 6 Amps | | Best Sellers Rank | #149,438 in Automotive ( See Top 100 in Automotive ) #570 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 out of 5 stars 38 Reviews | | 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 | | 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) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent *by M***E on February 12, 2026* Works flawlessly with my EarthX batteries. A serious charger for the new world of Li batteries. Very robust, you get what you pay for. I would recommend to people I know but I'm the only one with the lithium batteries. ### ⭐⭐⭐⭐⭐ Recommended for EarthX Lithium batteries *by A***R on January 24, 2026* Very nice system. Recommended for EarthX batteries. Instructions could be a little clearer. The thing I like is you can permanent leads that can be installed on the battery. This allows you to manage the battery from a location without direct access to the battery. ### ⭐⭐⭐⭐⭐ Best charger out there, its that simple. *by D***D on October 24, 2025* I did a lot of research and I have used many different brands of chargers. The OptiMate series of chargers can't be beat. They are the most sophisticated and problem free chargers out there. I have a number of them and they always do the job. I have even been able to bring a couple of batteries back to life. Highly recommend this product in its many superior forms. ## 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? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v](https://www.desertcart.co.uk/products/457735247-tecmate-optimate-lithium-4s-6a-tm391-10-step-12-8v) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-05-14*