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Battery Management Guide

Batteries are perishable products that start deteriorating as soon as they are produced. Many failures of batteries are actually caused by improper handling, usage, and storage. In order to ensure all batteries are properly treated and maintained, we provide the following basic guidelines for our customers as these simple preventive measures can significantly improve battery’s performance and service life.


Your battery will have a capacity written on it(for example 1600mah). Your charger will also have a charging capacity written on it(for example 400ma). This means the charger will charge the battery 400ma per hour. So this charger would take 1600/400 = 4 hours to fully charge the battery from a completely empty state. The battery should never be completely empty, so charging time will depend on how much charge it already has.

When charging your battery, you must continue to check it. Never leave it unattended. Once the battery is slightly warm to touch, this means it is fully charged. Charging any further will overcharge and damage the cells.

You can charge the battery from any state; you do not need to completely empty it each time. But beware that charging times will vary depending on the amount of charge left in the battery.

Never over discharge the battery. Once your boat is beginning to slow down, do not continue to discharge the battery until it is completely empty. Once the cells in the battery pass a certain level, they become vulnerable to damage due to over discharge.

After operation, allow 15 minutes for the battery to cool down before charging it.


Keep batteries in a cool and dry storage are free of corrosive gas. Recommended storage temperature is 20C

Avoid storing batteries for prolonged periods of time without cycling. Typical shelf life for a Ni-Cd battery is 2-3 years with self-discharge rate of 10% per month. Typical shelf life for a Ni-MH battery is 1-1.5 years but its self-discharge rate is about 1.5~2 times greater than that of a Ni-Cd battery. Self discharge rate will increase with higher temperatures.

Before Storage

Avoid fully charging before storage; keep batteries partially charged and apply a full charge before use.

Never store a battery on low charge, it will slowly discharge and damage the cells. Always store partially charged.

If you plan to store batteries longer than 90 days, charging your batteries every 90 days is highly recommended to maintain maximum capacity.

Avoid leaving the batteries connected to the boat when they are stored for a prolonged period of time; it may result in cell leakage.

Avoid dust piling on batteries during storage, especially on the battery terminal area.

General Use

Always keep your battery pack dry.

To prevent an accident from a short circuit, do not allow metal objects to come into contact with the battery terminals.

Keep battery packs away from high heat (temperatures above 60C/140F), fire and direct rays from the sun.

Do not disassemble or try to modify the battery pack.

Multiple factors can affect the overall reliability of a battery pack, so it is impossible to give an accurate prediction on battery’s life. If the above procedures are followed and implemented precisely, then a battery isl most likely to achieve it’s optimal cycle counts and give best performance during its service life.