OptiMATE Lithium 4s 0.8A Charger TM-471 - Safe LiFePO4 Maintenance

In this review the OptiMATE Lithium 4s 0.8A (TM-471) is evaluated as a dedicated charger and maintainer for 12.8V Lithium battery packs. The bottom line: it is aimed at owners of LiFePO4, LiFe and LFP batteries who want a safe, low-current maintainer that can revive batteries other chargers cannot. Reviewers will appreciate the chargers focus on long battery life, integrated safety for high-performance chemistry and a selective wake up mode that addresses batteries with a built-in BMS.

Key Features

• Longer battery life: The charger is designed to keep Lithium battery cells in peak condition, helping extend usable battery life when used as a regular maintainer.
• Ultimate protection: Built-in charging routine provides protection tailored to high-performance Lithium (LiFePO4/LiFe/LFP) battery chemistry to prevent overcharging and stress.
• Saves dead batteries: The unit includes recovery capability to revive deeply discharged batteries that many conventional chargers will not recognise.
• BMS wake up mode: A safe wake up sequence brings batteries with an integrated Battery Management System out of sleep mode without bypassing the BMS protections.
• Sealed charger design: Intended as a maintainer for stored or infrequently used equipment, the sealed charger reduces maintenance and risk in varied environments.

Who It's For

The OptiMATE Lithium 4s 0.8A is best for owners of 12.8V LiFePO4 or similar Lithium packs who need a reliable trickle charger and maintainer that prioritises battery longevity and safety. It suits motorcycles, powersports, small marine craft and backup systems where slow, controlled charging and occasional battery recovery are key.

It is less appropriate for users who need fast high-current charging or who require multi-voltage programmable chargers; those customers should look for higher-amp or multi-stage power supplies. Also, if you do not use Lithium chemistry, a charger matched to lead-acid or other battery types would be a better fit.

Pros & Cons

Pros

• Designed to extend battery life through controlled maintenance charging for LiFePO4/LiFe/LFP cells.
• Includes a safe BMS wake up mode that can recover batteries with integrated protection circuits.
• Customers report easy plug-and-play use and reliable charge safety with overcharge prevention.
• Good quality construction and predictable charging behaviour praised by owners.

Cons

• Low 0.8A output means charging and recovery are slow compared with higher-amp chargers.
• Not intended for non-Lithium battery chemistries, so compatibility is limited to LiFePO4/LiFe/LFP and similar.

Specifications

Product name	OptiMATE Lithium 4s 0.8A (TM-471)
Output voltage	12.8V (4s LiFePO4 nominal)
Output current	0.8A
Battery chemistry	LiFePO4 / LiFe / LFP
Function	8-step sealed battery charger and maintainer
Special mode	BMS wake up mode for batteries with integrated protection

Our Verdict

The OptiMATE Lithium 4s 0.8A is a practical, safety-focused maintainer for 12.8V Lithium battery owners who value long battery life and reliable maintenance. It recovers protected batteries and prevents overcharge, making it good value for riders and small craft owners who need a low-current, dependable charger rather than fast bulk charging.

Frequently Asked Questions

Can it wake a battery with an integrated BMS?
Yes. The unit includes a BMS wake up mode that safely brings batteries out of sleep without defeating protection circuits.

Is this charger suitable for lead-acid batteries?
No. It is designed specifically for LiFePO4/LiFe/LFP chemistry and is not intended for lead-acid or other unrelated battery types.

How fast will it charge a typical 12.8V pack?
Charging is intentionally slow at 0.8A to protect cell life, so expect extended charge times compared with higher-amp chargers.