Just like other electronic devices, metal detectors need batteries to be functional. If you’re planning on going out for a long hunt, you’ll want to be sure that you’re packing the best batteries for metal detectors so your gear doesn’t run out of juice.
Since most batteries only offer about 20 hours of active power, you’ll likely also have to pack replacements. Fortunately, there is a vast range of reliable batteries for metal detectors that you can choose from to ensure longevity reliability when you’re out on the hunt.
What kind of batteries do metal detectors use?
Metal detectors are designed differently than other devices, with some of the newest models such as Minelab Equinox and Quest having built-in rechargeable batteries, while others like the Garrett Ace Series are designed to work with disposable AA batteries.
With such a wide range of options, deciding which battery is the best for your metal detector can be quite challenging. We’ve taken the liberty of assembling a list of the most reliable and durable batteries in our opinion.
Alkaline Batteries
What makes these the most popular option for metal detectors is their long shelf life, as they have a remarkably low self-discharge rate of only 0.3 percent per month. This low discharge rate allows them to maintain a charge for up to 10 years when not in use. However, this can vary depending on the battery’s quality.
Alkaline batteries offer a voltage output of 1.5V, a good capacity, a superior drain rate for various applications, and a wide range of operating temperatures. This makes them ideal for powering portable devices such as your metal detector.
They are available in various shapes and sizes including 9 V, D, C, AA, and AAA. Many of the leading metal detector brands such as the Bounty Hunter, Garrett, and Fisher use AA alkaline batteries, as they offer superior battery life and work with most advanced detectors.
Most alkaline batteries can only be used once and then are disposed of in your normal trash as they don’t contain heavy metals that pollute the environment. However, there are also rechargeable ones that allow up to 500 charges. But, the capacity of rechargeable models usually diminishes with every charge or discharge.
They can be used immediately after purchase though, and are more cost-effective to use. One possible downside of alkaline batteries is their high internal resistance, which can reduce the power output.
Rechargeable batteries
Rechargeable batteries are also widely used for metal detectors due to their ability to maintain a charge for several months when stored correctly. They are also preferred by many for their reduced total cost of use and lower environmental impact than disposable batteries.
The common types of rechargeable batteries for metal detectors include:
- Nickel-Metal Hydride Batteries (NI-MN): A high-quality rechargeable battery such as the Minelab Battery NiMH 1600mAh offers a capacity up to 2 times higher than that of Nickel-Cadmium batteries. On a full charge, this battery should give you up to 8 hours of continuous use while you’re out hunting without leaking or failing.
- Lithium-ion Batteries: While they are more expensive, these batteries can hold a charge longer than other battery types. They are also typically lighter and have a much lower self-discharge rate than other rechargeable batteries, which makes them one of the best for metal detecting.
- Nickel-Cadmium Batteries (NI-CD): Are the cheapest rechargeable batteries that allow up to 1000 charges. They also perform well at low temperatures, can be discharged quickly, and have a low capacity. However, they are environmentally unfriendly and suffer from memory loss, which significantly reduces their capacity.
Note: To make sure you choose a reliable rechargeable battery for your metal detector, you should check the battery’s initial capacity, the rate at which the capacity deteriorates with each charge, and how long it holds a charge when in use and when stored.
How long do batteries last in a metal detector?
Metal detectors vary greatly in terms of power consumption, with some of the newer models having smaller power requirements, while others can drain the batteries within a few hours.
When in use, your metal detector’s batteries should last anywhere between 20 to 30 hours, but the length may vary depending on the type of batteries you’re using, the quality of your detector, and how frequently you use it.
How to Conserve Battery life
One of the best ways to increase your metal detector’s battery life is by using headphones, because less power is used compared to using the internal speaker. You should also try fine-tuning the various settings for optimal performance and less power consumption. Don’t overcharge the batteries either as it usually deteriorates the battery life.
