Marine Battery User Manual 2022-07-30


Lithium Iron Phosphate (LiFePO4 or LFP) batteries are safe to use indoors and outdoors. However, as with any battery, safety measures must always be taken. Please follow the instructions within this user manual for the safe handling and operation of OSN POWER batteries.


  • Always wear protective gear when handling batteries.
  • Never attempt to open or disassemble a battery. If accidental contact with internal battery contents occurs, wash the affected skin area and contact a doctor for further medical assistance.
  • Do not expose the battery to water or saltwater, or allow the battery to get wet.
  • Keep sparks, flames, heat sources (> 50°C/122°F), and metal objects away from batteries.
  • Make sure all cable connections are properly tightened.
  • Battery Cables should have some slack and not be tightly stretched.
  • Install and remove batteries using the lifting handles provided.
  • The battery MUST be securely mounted into the vehicle or boat.
  • If the battery emits a peculiar smell, heating, distortion, or appears to have any abnormality
  • during operation or storage, please remove the battery and move it to a safe location. Contact OSN POWER for further details.
  • If the battery leaks and any chemicals get into the eyes or on the skin, do not rub or wipe. Rinse with clean water and seek medical attention immediately.
  • Always use a charger with a Lithium profile and ensure that it has been selected. If using an inverter, ensure that it does not exceed the specifications of the battery.


  • If battery cuts out on low voltage immediately disconnect load – Low voltage cut off device strongly recommended at 9.5V.
  • If battery gets below 9V, charge battery within 15 days.
  • Battery should be charged every 6 months.
  • Ideal storage temperature -20℃ – 35℃ .
  • Do not leave battery in low state of charge for long periods of time.
  • Keep battery away from high temperatures.
  • If battery shows signs of deformation, heat or emits smell, immediately discontinue use.





Lead-acid equivalent

Cranking amps






PbEq 10-14Ah







PbEq 14-20Ah







PbEq 20-30Ah







PbEq 26-40Ah




4.Warranty Information

OSN POWER Batteries offers a 2-year Limited Warranty to be free of defects in material and workmanship.

All batteries must be registered within the first 30 days from the original purchase date or the original purchaser must provide an original receipt to be eligible for a warranty claim. Returns will only be accepted from the Original Purchaser.

What Does OSN’s Warranty Cover?

If the battery fails within the free replacement period due to defects in materials and/or construction we will replace it with the same model battery free of charge.

What Doesn’t OSN’s Warranty Cover?

- Any physical damage caused by abuse or improper installations.

- Any modification to any part of the battery or its parts.

- Use of charger NOT intended specifically for LFP Batteries or charged above 14.6 volts.

- Overcharging due to a defect with the vehicle’s voltage regulator or defective charging system.


  • Always use a battery charger with a lithium profile that does not exceed the charging specifications of the battery.
  • Charger must not contain Sulphation/Equalisation setting. If so then this needs to be turned off.
  • The charging table below should be when charging. For 12V battery, the max charge voltage is 14.6V, float charge voltage is 27.8V
  • Do not have batteries sit on float charge for an extended period of time.
  • Please ensure your charger is matched to the current rating of your battery and take note of the recommended charge current in the batteries specification sheet –Normally half the batteries rated capacity. For example CB1260S –Recommended charge current = 30A.
  • Do not charge the marine battery after completely exhausted. When the device prompts “low battery”, it should be charged; Don’t discharge until the device shuts down automatically. If charge the battery after completely exhausted, it will affect the service life of the battery.
  • If the marine battery is not used for a long time, to charge to 60%, stored in a cool and dry place, and every 4 or 5 months for supplementary charging.
  • Don’t overcharge. The charger should be unplugged when it is indicated to be full. Current chargers are generally full of automatic stop design, a short time not to take off the your marine battery from the charger is fine, but leave the battery on the charger for a long time is not OK.
  • At night when the power grid voltage rises, the charger has stopped charging, after the voltage rises, it will continue to charge, causing the battery overcharging. This can affect battery life.
  • Avoid frequent overcharging. In order to prolong the life of the marine battery, the battery needs a good management system. Even the best deep cycle marine battery can dramatically shorten their life if they discharge at less than 50% of their rated capacity. So don’t underestimate the impact, overdischarge is the single biggest cause of battery failure.
  • There is no such thing as overcharging with good chargers, but overcharging with low quality chargers is inevitable. Overcharging can cause the temperature inside the battery to rise too high, which is harmful to lithium ion marine battery and charger.

6.  Storage

  • Please store marine battery in a dry and cool place, the marine battery should be stored in a dry environment of 15 ° C to 35 ° C or packed in a moisture-proof package. Keep away from heat sources and direct sunlight. Avoid contact with metal contacts.
  • Due to the very low self-discharge rate of lithium ion marine battery, it can be stored at 20℃ for more than half a year, most of the capacity can be restored. Self-discharge phenomenon of lithium ion marine battery, such as 18650 cell, if the cell voltage is lower than 3.6V for a long time, will lead to over-discharge of the battery and damage the internal structure of the battery, reducing the battery life.
  • Therefore, the long-term storage of lithium ion marine battery should be charged every 3-6 months, that is, charged to 3.8-3.9V voltage (the best storage voltage of lithium battery is about 3.85V), keep in 40%-60% of the discharge depth is appropriate, not full.

Leave a message

Leave a message

    Click Here to Get Solution and Quotation.