---
product_id: 457735247
title: "OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green"
brand: "tecmate"
price: "VT57078"
currency: VUV
in_stock: true
reviews_count: 12
category: "Tecmate"
url: https://www.desertcart.vu/products/457735247-optimate-lithium-4s-6a-tm391-10-step-12-8v-6a
store_origin: VU
region: Vanuatu
---

# 6A high charging current 10-step advanced charging program Integrated BMS protection OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer, Blue/Green

**Brand:** tecmate
**Price:** VT57078
**Availability:** ✅ In Stock

## Summary

> 🔋 Charge smarter, last longer—never miss a beat with TM391!

## Quick Answers

- **What is this?** 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?** VT57078 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/457735247-optimate-lithium-4s-6a-tm391-10-step-12-8v-6a)

## 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:** Seamlessly reactivates batteries with built-in management system safety.
- • **TUNE Mode Stability:** Ensures flawless ECU programming support without battery stress.
- • **10-Step Smart Charging:** Precision battery care that extends lifespan and performance.
- • **Plug & Play Simplicity:** Effortless operation for busy professionals—no guesswork needed.
- • **Power-Packed 6A Charging:** Maximize battery revival speed with industry-leading current output.

## Overview

The Tecmate OptiMate TM391 is a cutting-edge 12.8V lithium battery charger delivering a robust 6A current through a sophisticated 10-step charging and maintenance program. Designed specifically for high-performance LiFePO4 batteries, it features integrated BMS wake-up and TUNE modes to ensure optimal battery health and reliable ECU programming support. Lightweight and user-friendly, it’s the go-to charger for professionals demanding peak battery performance and longevity.

## 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: Best charger out there, its that simple. - 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.
Review: Very easy to use - The manual has many modes of operation but it also functions perfect for a plug and play. I have a lithium ion battery on my motorcycle and it has kept the battery healthy in periods of no use.

## 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 | #136,765 in Automotive ( See Top 100 in Automotive ) #611 in Battery Chargers |
| Brand | Tecmate |
| Customer Reviews | 4.8 4.8 out of 5 stars (35) |
| Date First Available | April 29, 2022 |
| Exterior | Machined |
| Item Weight | 9.6 ounces |
| Item model number | TM391 |
| Manufacturer | TecMate |
| Manufacturer Part Number | TM391 |
| Model | OptiMate Lithium 4s 6A, TM391, 10-step 12.8V 6A Lithium Expert Battery Saving Charger & Maintainer |
| Product Dimensions | 8.74 x 3.5 x 2.48 inches |

## Product Details

- **Brand:** Tecmate
- **Color:** ['Blue']
- **Item Weight:** 9.6 Ounces
- **Output Voltage:** 12.8 Volts (DC)
- **Specification Met:** ecu

## Images

![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

### ⭐⭐⭐⭐⭐ 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.

### ⭐⭐⭐⭐⭐ Very easy to use
*by M***W on October 12, 2024*

The manual has many modes of operation but it also functions perfect for a plug and play. I have a lithium ion battery on my motorcycle and it has kept the battery healthy in periods of no use.

### ⭐⭐⭐⭐⭐ 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.

## 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

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**Shop now:** [https://www.desertcart.vu/products/457735247-optimate-lithium-4s-6a-tm391-10-step-12-8v-6a](https://www.desertcart.vu/products/457735247-optimate-lithium-4s-6a-tm391-10-step-12-8v-6a)

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-02-20*