Battery Tender 800 mA SuperSmart 12V Battery Charger — Sealed Marine-Ready, Automatic Multi‑Stage Maintenance

The Battery Tender 800 is a compact SuperSmart 800 mA charger that automatically charges, monitors, and maintains 12V batteries while being fully sealed against moisture.

This small, lightweight charger delivers steady 800 milliamp charging with intelligent multi-stage control to keep batteries healthy long-term. Built for outdoor and marine conditions, the unit’s electronics are fully encapsulated in a thermally conductive, flame-retardant resin to resist shock, vibration and water exposure. Its universal 100–240 VAC input makes it usable around the world, and multiple protections guard against reverse polarity, sparks and short circuits.

How does the Battery Tender 800 protect batteries without needing user intervention?

The charger uses an onboard control IC to sense battery condition and automatically switch through charge stages—bulk, absorption and float—so the battery isn’t overcharged. After the battery reaches full capacity, it stays on a maintenance float to replace self-discharge and preserve charge.

• Automatic multi-stage charging adapts to battery state
• Maintenance float prevents overcharge and sulfate build-up
• Built-in reverse polarity and short-circuit protection

Is the Battery Tender 800 suitable for wet or marine environments?

Yes. The internal electronics are fully encapsulated in an electrically insulating and thermally conductive epoxy that protects against moisture, vibration and impacts. The design allows the charger to function reliably in damp or splash-prone conditions where ordinary chargers would fail.

• Encapsulated circuitry resists shock, vibration and moisture
• Flame-retardant, UL-recognized resin enhances safety
• Engineered to withstand outdoor and marine use

What vehicles and batteries work best with this 800 mA charger?

The Battery Tender 800 is sized for small to medium 12V lead-acid batteries found in motorcycles, ATVs, personal watercraft, boats, and similar engines. Its steady 800 mA output is ideal for maintaining charge on seasonal or infrequently used vehicles without overheating smaller batteries.

• Recommended for 12V lead-acid and AGM batteries on motorcycles and ATVs
• Good for marine trolling motors and small boat batteries needing maintenance charging
• Compact size fits tight storage spaces on vehicles and docks

How easy is it to install and use the Battery Tender 800?

Installation is straightforward: connect the clips or ring terminals to the battery, plug the charger into an AC outlet, and the unit automatically handles charging and maintenance. Its compact footprint and lightweight housing make it mountable in many locations and convenient to carry.

• Simple clip or ring-terminal connections for fast setup
• Universal 100–240VAC input works worldwide without a transformer
• Small size—about the size of a computer mouse—mountable for permanent or temporary use

Who this is for: The Battery Tender 800 is for riders, boaters, and outdoors enthusiasts who need a reliable, low-maintenance charger to preserve battery life in wet or vibration-prone environments. It suits anyone who stores seasonal vehicles, travels internationally, or wants a durable, automated maintenance charger that can be left connected without worry.