When you're shopping for marine electrical batteries lighting, the first decision is often the type of battery itself. Do you want a small lithium unit that's built to crank an outboard and power light gear, or a larger dual-purpose AGM that can start the engine and also run your trolling motor and electronics? The Redodo 12V 20Ah LiFePO4 Lithium Marine Cranking Battery is listed at $165.99, while the Interstate Batteries Marine/RV Group Size 24 Dual Purpose AGM Battery comes in at $259.95. That $93.96 spread puts them at different price points, but the right choice is about matching the battery to your boat and routine.
Quick verdict: If you have a kayak, small outboard, or trolling motor and you want a compact lithium battery that can handle starting and lighter loads, the Redodo is the more straightforward pick. If you need one battery to both start a larger motor and run accessories for extended periods, the Interstate's 70Ah dual-purpose design gives you far more staying power.
Here's a side-by-side look at the key specs:
| Feature | Redodo 12V 20Ah LiFePO4 | Interstate Group 24 AGM |
|---|---|---|
| Price | $165.99 | $259.95 |
| Chemistry | Lithium iron phosphate (LiFePO4) | AGM (pure non-alloy lead) |
| Capacity | 20Ah | 70Ah |
| BCI Group Size | Group U1 | Group 24M |
| Primary role | Marine cranking battery | Dual-purpose (crank and deep cycle) |
The numbers tell the story: the Redodo is a dedicated starting battery with a small reserve, while the Interstate is a bigger energy reservoir that also needs to start the motor. That difference drives the price spread.
Where each product wins:
- Redodo wins on overall price and small footprint. It costs less and fits in compact battery trays, making it a natural choice for kayaks and small outboards. The lower price leaves room in your budget for other gear.
- Interstate wins on capacity and dual-duty flexibility. It's designed for both starting and accessory duty, and it has far more energy available for running electronics. If you spend long days on the water, that extra reserve reduces the chance of leaving yourself without power.
Redodo 12V 20Ah LiFePO4 Lithium Marine Cranking Battery
This compact lithium battery is aimed squarely at boaters who need reliable cranking power in a small package. It's IP67 waterproof, so it's comfortable living in a splashy environment, and the LiFePO4 chemistry is designed to resist shock and vibration compared to softer-pack cells. The included 20A BMS is part of the package. The compact casing is a major plus for tight battery trays. But the 20Ah capacity is the trade-off. It'll fire up an outboard and run a smaller trolling motor, yet you won't want to rely on it for hours of electronics use or heavy equipment operation.
Interstate Batteries Marine/RV Group Size 24 Dual Purpose AGM Battery
The Interstate is a dual-purpose workhorse. It's built to crank your motor and then keep supplying power to a trolling motor or accessories while the engine is off, which is exactly what many fishermen and RV owners want. It carries a 750 CCA rating, so cold-weather starting is handled, and the 24-month free replacement warranty adds peace of mind for a larger purchase. The trade-offs are its weight-about 44.6 pounds-and its footprint: a big heavy unit that needs a proper mount and enough tray space. If you can accommodate the size and need a battery that does double duty, this is the stronger option.
Final choice by use case:
Think about your typical day on the water. Are you mostly just cranking the engine and moving between spots, or are you running electronics for hours? If you're rigging a kayak, a small runabout, or a simple trolling motor setup and you want a compact, waterproof lithium battery at a lower price, the Redodo is the natural fit. If you need a single battery that can both start a larger motor and power accessories all day, the Interstate is worth the extra money and the extra space.
