Battery Tender® Weather Resistant 12V 800mA Battery Charger and Maintainer

The most inconvenient battery to maintain is the one you cannot easily reach — stored in an outdoor shed, kept at a marina slip, locked in a watercraft that only comes out seasonally, or mounted in equipment that lives outside year-round. The Battery Tender® Weather Resistant 12V 800mA goes where standard maintainers cannot: IP67-rated, permanently mountable, and designed to remain connected through rain, humidity, freezing temperatures, and outdoor conditions that would damage or destroy an indoor-only charger.

IP67 Weatherproofing — What It Actually Means

IP67 is an independent ingress protection rating that certifies complete dust protection and water immersion resistance to 1 meter for 30 minutes. In practical terms, the Battery Tender® Weather Resistant 12V 800mA withstands direct rainfall, splashing, high-pressure spray, condensation, and the humidity extremes of coastal and lakeside storage environments. It can be permanently mounted outdoors — on a wall, post, dock structure, or trailer — and left connected through seasons without any shelter required.

ISM: Smart Charging in Any Environment

Weather resistance without intelligent charging produces nothing more than a weatherproof trickle charger — which still damages batteries connected long-term. The Battery Tender® Weather Resistant uses ISM (Infinite Sequential Monitoring™), Battery Tender®'s proprietary 4-stage algorithm:

• Initialization — Health check and polarity confirmation before current flows
• Bulk Charge — Full 800mA output restores depleted capacity efficiently
• Absorption — Current tapers automatically as the battery approaches full charge, preventing overcharge damage regardless of outdoor temperature swings
• Float Maintenance — Precisely regulated micro-current maintains peak battery voltage 24/7, indefinitely, without overcharging — even when left connected through winter

The 800mA output is optimized for 12V powersports batteries from 3Ah to 30Ah. All standard lead-acid chemistries: flooded, AGM, gel cell, and sealed maintenance-free.

Purpose-Built for Outdoor and Permanent Installation

• Motorcycles in open-sided garages or uncovered outdoor spaces
• ATVs and UTVs in outdoor sheds without climate control
• Personal watercraft at seasonal dock or marina storage
• Snowmobiles in unheated outbuildings or pole barns
• Boats at outdoor storage facilities or marina slips
• Lawn equipment in open-air equipment sheds
• Trailers with onboard batteries in exposed storage locations
• Any application where connecting and disconnecting an indoor charger each session is impractical

Permanent Mounting — Set Once, Maintain Every Season

The Battery Tender® Weather Resistant includes mounting hardware for permanent installation. Mount it once in the storage location — on the shed wall, the dock structure, a bracket near the storage pad — and connect vehicles each season without relocating the charger. For marina operators and fleet storage facilities, permanently mounted units at each slip or bay eliminate portable charger logistics while ensuring every battery is maintained continuously through off-season storage.

Outdoor Temperature Extremes Handled Automatically

Outdoor storage means exposure to temperature ranges that cause indoor chargers to fail — hard freezes, humid summers, rapid temperature cycling between day and night. The Battery Tender® Weather Resistant is designed to operate correctly across this full range. Automatic temperature compensation adjusts charge voltage throughout the charging cycle: increasing voltage in cold to ensure a complete charge, reducing in heat to prevent overcharging and gassing. No manual adjustment at any temperature.

Safety Features

• Spark-proof connection — No current flows until polarity and connection are confirmed correct
• Reverse polarity protection — Automatic shutdown if clamps are reversed
• Short-circuit protection — Automatic fault detection and shutdown
• ETL and CETL certified

End Off-Season Battery Failures Permanently

Sulfation — the permanent, irreversible hardening of lead sulfate on battery plates from sitting discharged — is the primary cause of battery failure in stored outdoor vehicles and equipment. A single off-season without maintenance charging can sulfate a battery beyond recovery. The Battery Tender® Weather Resistant prevents sulfation entirely through continuous float maintenance, wherever the vehicle is stored. Battery life consistently extends from 2–3 years to 5 years or more. One permanently mounted Weather Resistant unit pays for itself in the first battery replacement it prevents.

Limited Warranty | DeLand, Florida Since 1965