When you're putting together marine electrical batteries lighting for a boat, the first fork in the road is cranking power versus deep-cycle capacity. Do you need a burst of current to start an outboard, or sustained energy for trolling motors, electronics, and lights all day? The Redodo 12V 20Ah and GOLDENMATE 12V 50Ah take very different approaches to that question.
Quick verdict
If your priority is cranking power for an outboard, the Redodo 12V 20Ah is the dedicated starting battery with a 40C discharge profile and a compact Group U1 case. If you want more capacity for trolling motors, electronics, camping, and RV use, the GOLDENMATE 12V 50Ah offers a bigger energy reserve at a lower price. The Redodo lists at $165.99, the GOLDENMATE at $95.99, so the $70 gap is significant.
Comparison
| Metric | Redodo 12V 20Ah | GOLDENMATE 12V 50Ah |
|---|---|---|
| Price | $165.99 | $95.99 |
| Capacity | 20Ah | 50Ah |
| Best for | Cranking, trolling motor, kayak | Marine, camping, RV, home/garden |
| Waterproofing | IP67 | IP67 |
| Charging mode | MPPT | Charger/MPPT/PWM |
| BMS | 20A BMS | Multi-layer protection (overcharge, over-discharge, overcurrent, overvoltage, overheating, short-circuit) |
Where each product wins
Redodo 12V 20Ah wins for starting-focused duty. Its cranking design is aimed at high-current bursts that the deep-cycle GOLDENMATE isn't engineered for.
GOLDENMATE 12V 50Ah wins for capacity and price. It holds roughly two and a half times the amp-hours of the Redodo, covers a wider list of applications, and costs a good deal less.
Product notes
Redodo 12V Cranking Battery
The Redodo is a compact lithium pack that prioritizes current delivery over raw capacity. It offers a 40C discharge rate and prismatic cells, the type used in luxury-car starting batteries, and the Group U1 size keeps it easy to mount in tight engine boxes or kayak compartments. With a modest capacity, it's best for short, high-power bursts and modest accessory loads. The trade-off is the price: this is the pricier battery, and you get less total energy than the GOLDENMATE. If you need consistent power for an overnight trip or a camp setup, the smaller capacity will run out sooner. But for starting an outboard and running a trolling motor with quick bursts, it's the more purpose-built choice.
GOLDENMATE 12V Deep Cycle Battery
The GOLDENMATE is the high-capacity option here. With a large capacity, it can maintain power for hours longer than the Redodo, making it a natural fit for trolling motor use, camping, RV accessories, and backup electronics. It supports series and parallel connections, so you can add a second battery down the line. It also supports charger, MPPT, and PWM charging modes, which gives you flexibility in how you recharge it. The two caveats are the certified refurbished condition and the deep-cycle focus. It isn't designed to deliver the same starting surge as the cranking Redodo, so it's better suited to sustained loads. Still, it's the lower-priced option and gives you more capacity for sustained use.
Final choice by use case
If your boat has a high-performance outboard or you need a dedicated cranking battery for kayaks and trolling motors, the Redodo 12V 20Ah is the fit.
If you need a deep-cycle workhorse for trolling motors, RV, camp setup, or backup electronics, the GOLDENMATE 12V 50Ah gives you more runtime for long days on the water.
Both are IP67 waterproof LiFePO4 batteries, so you get lithium reliability and waterproofing either way.
