Overview

The Attwood Marine 9099-5 is a battery tray with strap for Group 29 and Group 31 batteries. Its inside dimensions are 12-7/8 in. x 7 in., and it is sized for batteries up to 10-1/2 in. tall, which makes it a straightforward match for larger 12V house or starting batteries that need a fixed mounting point.

This is an open tray rather than a covered battery box, so it works best where the battery already sits in a dedicated compartment, under a seat, or in another protected area on board. The strap uses a positive-locking quick-disconnect buckle, so the battery stays restrained underway but can still be removed without fighting a hard-to-reach hold-down.

For boat owners replacing a worn tray or setting up a simple battery mount, this piece keeps the installation focused on the basics: the right footprint for Group 29/31 batteries, a molded base, and a strap system that makes routine battery service less awkward.

Key features

• Fits Group 29 and Group 31 batteries
• Inside tray size of 12-7/8 in. x 7 in. for footprint matching before installation
• Accepts batteries up to 10-1/2 in. tall
• Polypropylene hold-down strap with a positive-locking quick-disconnect buckle
• Molded base mounts through four #10 panhead fastener points

Compatibility and fit

This tray is meant for battery installations where the battery case dimensions match Group 29 or Group 31 standards. Before ordering, it is worth checking both the battery footprint and the vertical clearance above the battery, especially in compartments with low lids, nearby wiring runs, or seat bases above the tray.

Because this is a tray-and-strap setup, it suits installations where you want the battery secured to the boat structure while keeping the top of the battery accessible for cable service, charging, inspection, or replacement.

Installation and setup

The molded base mounts with four #10 panhead fastener locations, giving the tray a clear attachment pattern on a flat surface. On a boat, the best result comes from mounting it to a solid base that can handle battery weight and vibration without flexing.

The quick-disconnect buckle makes battery removal simpler during maintenance or seasonal replacement. Once the battery is seated in the tray, the strap can be tightened across the case to keep movement under control when the boat pounds through chop or sees repeated engine vibration.

Use on board

This tray is a good fit for skiffs, center consoles, small cruisers, and other boats that use Group 29 or 31 batteries in an exposed compartment or battery shelf rather than inside a full battery box. It also makes sense in refit work when the goal is to replace an older tray without changing battery group size or reworking the whole compartment.