Genius 3500 Portable Battery Charger

Model # 14995823 | Mfg # G3500 | UPC # 46221100334

This item is no longer available.

Portability that is compatible with all batteries—even 6V and Lithium-ion.

Ideal for personal watercraft, power equipment and motorcycles, this compact automatic charger and maintainer is packed with features. The 8 stage Noco Genius charger evaluates and monitors the battery for faults, charge level and battery activity to deliver a safe and efficient charge with no risk of overcharge. A battery desulfator helps to remove sulfur crystals on the plates to restore lost battery life. An advanced diagnostic feature will indicate damaged batteries. The Genius can even recharge batteries that have been discharged down to 2V. Unique cables feature alligator clips with integrated ring terminals to give users a hardwire option; the charger can be mounted using the two counter sunk holes. A battery charger doesn’t have to weigh a ton or be as big as the battery to be effective, the Noco Genius is every bit the charger your father had and more—and it’s a fraction of the size.

Key Features

  • Compact portable 8 step automatic battery charger
  • Compatible with 6V and 12V flooded, AGM, Gel batteries and Lithium-ion batteries
  • Can recover deeply discharged batteries (down to 2V)
  • Automatically monitors charge level to prevent overcharging batteries
  • Intuitive LED indicator lights to select battery type and provide state of charge information
  • Includes alligator clip with integrated ring terminals for hardwire option
  • Ideal for personal watercraft, motorcycles, lawn equipment and other batteries between 2.2—120Ah
  • CANbus enabled means it can be used to bypass ignition switch shutdown systems on some vehicles
  • Spark proof and reverse polarity protection

Owner’s Manual

Data Sheet


Genius 3500 Portable Battery Charger

Name Value
Amperage 3.5 Amps
ISO Approved Marine UL Listed
cUL Listed
Multi Bank Chargers 1 Bank
Type Chargers
Voltage 12 Volts DC
Warranty Details Five Year Limited


The West Advisor articles have answered boaters' questions and provided solutions to boating problems for more than 20 years. West Marine has compiled one of the Web's most comprehensive collections of technical boating information articles.


Product Q & A


To receive your order by December 24th, 2018, please reference the 2018 Holiday Shipping Schedule.

FREE DELIVERY to West Marine Stores

  • Available for ALL products including hazardous & truck freight items.
  • Ship to over 240 U.S. store locations.
  • Contiguous United States orders arrive in 7 - 10 days.
  • Hawaii and Alaska orders arrive in 10 - 16 days.
  • Expedited shipping is available for an additional fee.
  • Not available in Puerto Rico.

FREE SHIPPING on orders over $49.00

  • Applicable on orders over $49.00 within the 48 contiguous United States.
  • Does not apply to Truck Freight.
  • No coupon code required.
  • Orders will be delivered within 3 - 7 business days.


We stand behind everything we sell. If at any time your West Marine purchase does not meet your expectations, you can return it for a replacement or refund. If you are a West Advantage Rewards member, you don't even need a receipt - we'll have a record of your purchase. Returns can be made via mail or in person at their nearest store location. If you are not a West Advantage Rewards member, we will first need to verify your purchase by receipt or other method.

We do carry a few items that cannot be returned. This includes: items with expiration dates that have expired such as flares, charts, annual publications; items registered to the user such as boats, motors, EPIRBs, PLBs, SPOT, Class B AIS, life rafts; customized items such as rigging, and boat covers, computer software and electronics charts. Other non-returnable items include carry-on air conditioners, generators and select electronics. We will help you contact the vendor for assistance or repair on product that cannot be returned to West Marine. Items containing hazardous material may only be returned to a West Marine store.

Hazard Shipping

Standard Shipping (ground service) is used to ship items that are considered hazardous. Estimated delivery is 3 – 7 business days and only applicable on deliveries within the contiguous United States. Signature Required for receipt of shipment.

For additional inquiries, you may call Customer Service at 1-800-BOATING (262-8464).