OptiMATE Lithium 4s 0.8A - LiFePO4 Charger & Maintainer

In this review of the OptiMATE Lithium 4s 0.8A the bottom line is simple: this compact charger is aimed at owners of 12.8V LiFePO4 batteries who need reliable maintenance charging and a safe way to recover units that have gone to sleep. The reviewer found it especially valuable for small battery banks and individual high-performance lithium batteries, because its BMS wake up mode and multi-step charging routine consistently protected cells and extended usable life during regular storage and light use.

Key Features

• Longer battery life: The charger uses a multi-step charging routine to maintain LiFePO4 cells and reduce capacity loss over time.
• Ultimate protection: Integrated protections ensure safe charging for high-performance Lithium (LiFePO4 / LiFe / LFP) batteries without overcharging risks.
• Saves dead batteries: It can revive deeply discharged units that many other chargers cannot handle safely.
• BMS wake up mode: The charger can safely wake batteries that have an active Battery Management System and are in sleep mode.
• Sealed design: Built as a sealed maintainer unit for indoor or sheltered outdoor use, it is suited to storage and seasonal maintenance.

Who It's For

The OptiMATE Lithium 4s 0.8A is best for boat owners, powersports enthusiasts, or owners of small 12.8V LiFePO4 battery packs who need a gentle, reliable maintainer rather than a high-current fast charger. It excels when batteries are left unused for extended periods and require a charger that both protects cell chemistry and offers recovery for low-voltage batteries.

It is not ideal for users who need rapid charging of large capacity banks or multiple batteries at once; those users should consider higher-amp Ampmatic models or multi-bank chargers with greater output. For single-bank maintenance and recovery of LiFePO4 cells, however, this model is a focused, practical choice.

Pros & Cons

Pros

• Dedicated LiFePO4 charging profile delivers safe, long-term maintenance.
• BMS wake up mode restores batteries with integrated protection systems back to service.
• Sealed, fully automatic operation makes it easy to set and forget during storage periods.

Cons

• Limited 0.8A charge current makes it slow on larger capacity batteries and unsuitable for quick top-ups.
• Single-bank output means it cannot charge multiple batteries simultaneously.

Specifications

Our Verdict

The OptiMATE Lithium 4s 0.8A is a smart buy for anyone who needs a safe, low-current maintainer and recovery tool for 12.8V LiFePO4 batteries. Its protected charging routine and BMS wake up mode deliver good long-term value for single batteries and seasonal applications, though those needing fast charging or multi-bank capability should look elsewhere.

Frequently Asked Questions

Can this charger revive a deeply discharged LiFePO4 battery?
Yes. The unit includes a BMS wake up mode designed to safely bring batteries with integrated protection out of sleep or deeply discharged states.

Is it safe to leave connected long term?
Yes. The OptiMATE operates fully automatically and is intended as a maintainer, so it can be left connected during storage to preserve battery health.

Will it charge large-capacity 12.8V battery banks quickly?
No. With a 0.8A constant current output it is designed for maintenance and recovery, not rapid charging of large capacity banks.