Group U-1 Gel Deep Cycle Marine Gel Battery, 31.6 Amp Hours


In stock online.
Can only be shipped to store
Model # 15020365 | Mfg # WM8GU1H | UPC # 25282164028

Deep cycle gel batteries take your house bank or trolling motor to the next level

Gel batteries go beyond the conventions of traditional flooded and AGM batteries to provide a longer life and more durability. At a 1% monthly discharge rate, these batteries are able to tolerate long periods without being charged and still be ready for the water when you are. Our gel batteries will also stand up to being discharged for long period of time and bounce back to full capacity when charged. By locking the electrolyte in a thixotropic gel the risk of vibration damage is nearly eliminated. Rough seas or long dirt roads are no match for gel batteries. Because there is no fluid, gel batteries can be installed in any position (except upside down); they are great for installations in hard to reach areas. Like flooded and AGM batteries, Gel batteries require a specific charge profile that is not available on all chargers. We recommend checking the specifications of your charger to confirm compatibility. If you want a battery that will stand up to marine use and so much more, our gel batteries are the answer.

Manufactured in the U.S. for West Marine by East Penn, one of the most reputable battery companies in the country. Each battery receives over 250 quality control checks to guarantee consistent and superior performance. East Penn’s award winning factory leads the industry in closed loop and sustainable practices. Nearly all of the plastics, lead and acid are recycled, so our batteries are great for your boat and the environment.

Key Features

  • Deep cycle batteries are designed to handle the power drains that other batteries cannot
  • Ideal for trolling motors and house banks
  • Superior vibration resistance
  • Can be installed in an multiple position (except upside down)
  • Suited for hard to reach locations
  • Will charge to full capacity even if left discharged for long periods of time
  • Will serve as an emergency start battery if CCA specification matches that of your engine
  • Enhanced durability design to withstand wear of extended cycling service
  • Gel encased electrolyte provides superior vibration resistance
  • Safer to install and transport with no-spill design to prevent leaking acid
  • Manufactured in the USA


  • Group Size: Group U1
  • Terminal Type: Terminals have round holes
  • Amp Hours (Ah):6
  • Cold Cranking Amps (CCA): 200
  • Marine Cranking Amps (MCA): 290
  • Reserve Minutes: 44
  • Weight: 23 lbs.
  • Dimensions: 8 5/16"L x 5 1/8"W x 7 1/4"H
  • Warranty: 24-month free replacement

Core charge will apply to battery purchase if an old 12V battery is not exchanged at the time of purchase.

Gel battery compatible chargers

 WARNING: Battery posts, terminals and related accessories contain lead and lead compounds, chemicals known to the State of California to cause cancer and reproductive harm. Batteries also contain other chemicals known to the State of California to cause cancer. Wash hands after handling. For more information, go to www.P65Warnings.ca.gov.


Group U-1 Gel Deep Cycle Marine Gel Battery, 31.6 Amp Hours

Name Value
Amperage Hours 31.6
Battery Type Gel
Group Size Group U1
Best Use Deep Cycle
Cold Cranking Amps 200 CCA
Dimensions 5 1/8" Width x 7 1/4" Height x 8 5/16" Length
Marine Cranking Amps 290 MCA
Reserve Minutes 44
Type Tapered Stud
Voltage 12 Volts DC
Warranty Details Two Years


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.

Related West Advisor Articles


Product Q & A


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.

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