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The GPL-31T Marine & Yacht Vehicle Battery From Lifeline Battery Corporation

GPL-31T is designed for Deep Cycle Marine Applications.

The GPL-31T has an Expected Cycle Life 1,000+ cycles to 50% DOD.
These AGM deep cycle batteries are rated for 550 cycles at 80% DOD.
Lifeline does not recommend batteries being cycled at 100% DOD.
Please refer to page 36 of the tech manual for DOD chart here. (pdf)

Printable Page
GPL-31T Technical Drawing (PDF)
GPL-31T Printable Specs Flyer (Word)
Marine Battery Sizing Calculator DC-DC
Marine Battery Sizing Calculator AC-DC

Lifeline GPL-31TDeep Cycle Marine BatteryLifeline GPL-31T Marine Battery
Lifeline Marine Batteries
Click to enlarge


Marine Battery Specifications:
Voltage 12v
Length - in(mm) 12.90
Width - in(mm) 6.75
Height - in(mm) 9.27
Weight 64.00 lbs / 29.00 kgs
Lifeline Battery
Part Number
Cold Cranking Amps Rated Cap.
Amp. Hrs
20 Hr Rate
Minutes of Discharge
68° 32° 25 Amps 15 Amps 8 Amps
GPL-31T 880 750 600 105 195 340 688
GPL-31T Technical Drawing (PDF)
GPL-31T Printable Specs Flyer (Word)
Marine Battery Sizing Calculator DC-DC
Marine Battery Sizing Calculator AC-DC

Lifeline Marine BatteriesDescription of Marine / Recreational Vehicle Battery:
Deep Cycle Marine/RV Battery The GPL-31T is a high performance, Mil-Spec, AGM battery, produced in the United States. Due to the Lifeline Battery's quality construction, it has an industry leading 2% per month self discharge rate at 77°F (25°C), compared to 10%+ for conventional batteries. Coast Guard approved, DOT Haz Mat Exempt, and longer lifespans than conventional batteries. Warrantied installations include marine, yacht, and other seafaring applications.
For GPL-31T RV and Recreational Vehicle Battery Applications, click here

GPL-31T Charging Instructions and Voltages:

Bulk Charge Voltages: 14.20 - 14.60
Absorbtion Charge Voltages: 14.20 - 14.60volts
Float Charge Voltages: 13.10 - 13.40
The GPL-31T is designed for charging amperages up to 262.5 amps or 250% of the rated Amp Hour Capacity due to low battery internal resistance.

What are Instant Amps?
Instant amps are a measure of the power discharged from a battery in .2 seconds, to your RV. This measurement allows you to truly see the power these batteries deliver to your starter motor, and why the RV starts up so well with a Lifeline AGM Battery. There is true power inside a Lifeline® Starting Battery or a Lifeline® Deep Cycle Battery.


NOTICE: The technical battery data contained herein has been reviewed and approved for general release on the basis that it contains no export controlled information. No part of this site may be copied or reproduced by any means, including electronic or mechanical, without written permission from Concorde Battery Corporation and Lifeline Batteries.

DISCLAIMER: The technical data contained herein is based upon the best information available as of the latest revision date. Concorde Battery Corporation the Manufacturer of Lifeline Batteries, makes no warranty of merchantability, fitness for any particular purpose, or any other warranty, expressed or implied, with respect to such information. Both Concorde Battery and Lifeline Battery assume no liability resulting from its use. It is the obligation of each user of the product to determine the suitability for any particular application, including marine battery and RV battery installation procedures, to comply with the requirements of all applicable laws regarding use and disposal of this product.

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292 E Arrow Highway, San Dimas, CA 91773
P: 909-599-7816 | F: 909-599-0596
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