OptiMate Lithium 0.8A

Overview

The OptiMate Lithium 0.8A is a dedicated charger and maintainer for 12.8–13.2V (4‑cell) LiFePO4 batteries. Its gentle 0.8A output protects small lithium starting batteries while bringing them to full capacity and maintaining them safely during storage.

Best for

• Motorcycles, ATVs/UTVs, scooters, and performance vehicles running LiFePO4 starting batteries
• Battery capacities ≈ 2–20Ah (sweet spot: 3–12Ah)
• Long‑term storage maintenance where safety and battery longevity matter more than charge speed

Avoid if you need

• Fast charging for larger batteries (>20–25Ah): choose a 2–5A LiFePO4 charger instead
• Compatibility with lead‑acid/AGM/gel or non‑LiFePO4 lithium chemistries (NMC, LCO): use a chemistry‑appropriate charger
• Engine starting or jump‑start capability: this is a charger/maintainer, not a booster

Key features

• 0.8A constant‑current charge tailored for small LiFePO4 batteries
• Cell balancing to help all cells reach the same voltage for consistent performance
• Low‑voltage/BMS recovery to safely bring a battery back within its normal operating range when conditions allow
• Automatic maintenance that tops up as needed without overcharging or floating like lead‑acid chargers
• Reverse‑polarity and short‑circuit protection; spark‑safe connection sequence
• 100–240V AC input for worldwide use; compact, weather‑resistant housing

Specifications

• Chemistry: 12.8–13.2V LiFePO4 (4S) only
• Max charge current: 0.8A
• Input: 100–240V AC, 50/60Hz
• Functions: charge, balance, low‑voltage/BMS recovery, automatic maintenance

Charge time estimates

Approximate times assume a healthy battery at room temperature. Actual time varies with battery condition and BMS behavior.

Battery capacity	20% → 100%	0% → 100%
4Ah	≈ 4.5–5 hours	≈ 5.5–6 hours
8Ah	≈ 9–9.5 hours	≈ 11–12 hours
12Ah	≈ 13–14 hours	≈ 17–18 hours
20Ah	≈ 22–23 hours	≈ 28–30 hours

How to use

1. Confirm the battery is 12.8–13.2V LiFePO4 (4‑cell). Do not use on lead‑acid or other lithium chemistries.
2. Turn vehicle ignition off. Connect the charger leads to the battery (positive to positive, negative to negative).
3. Plug the charger into AC power. Status lights will indicate charging, balancing, and maintenance stages.
4. Allow the charger to complete. For storage, you can leave it connected; it will monitor and top up as needed.
5. Unplug AC first, then disconnect the battery leads.

Safety and compatibility notes

• Temperature: Avoid charging LiFePO4 below 32°F (0°C). Warm the battery to above freezing before charging.
• Recovery mode: The charger can often recover a pack that has triggered BMS cutoff. If the battery is physically damaged, swollen, hot, or repeatedly trips the BMS, discontinue use and have it inspected.
• Do not use on lead‑acid/AGM/gel batteries or on lithium chemistries other than LiFePO4.
• For larger batteries (e.g., automotive LiFePO4 >25Ah), a higher‑current charger will reduce charge time.

Alternatives

• Need faster turnaround for 10–30Ah LiFePO4? Choose a 2–5A LiFePO4 charger/maintainer.
• Maintaining a lead‑acid/AGM battery? Use a dedicated smart AGM/lead‑acid maintainer.

FAQ

Can this charge a lead‑acid battery?

No. It is designed only for 12.8–13.2V LiFePO4 (4‑cell) batteries. Using it on other chemistries can damage the battery.

Is 0.8A enough for my motorcycle battery?

Yes for small packs (≈3–12Ah). It will also work on up to ~20Ah, but charging takes longer. For larger packs, consider a 2–5A model.

Can I leave it connected all winter?

Yes. Its maintenance program monitors the battery and tops up only when needed. Store the battery in a dry place above 32°F (0°C) and check cables periodically.

Will it recover a battery that has shut down due to BMS cutoff?

Often, if the pack is healthy and simply discharged. If recovery does not start or the battery gets hot or trips again, stop and have the battery checked.

Does it float charge like a lead‑acid maintainer?

No. LiFePO4 should not be held at a high float voltage. The charger monitors and tops up periodically to avoid stressing the cells.