Optima 8027-127 D27M Starting Battery (Important Features)

Published on: March 22, 2022
Written by Liam Jaxon / Fact-checked by David Rowan

Are you looking for a battery for your electric motor? The Optima 8027-127 D27M are the best for this application. You will be assured of the longest service and quick recharge times.

If you have an RV, and you need lots of power to cater to your onboard electrical equipment and RV’s starting motor, the Optima 8027-127 D27M is your best solution. 

optima 8027-127 d27m starting battery (important features)

If you like a hassle-free electrical power source, you will like this battery as well. This guide will take a look at this battery’s features and benefits.

Table of Contents

Optima 8027-127 Starting Battery

  • 800 Cold Cranking Amperes at Zero degrees Fahrenheit;
  • Cranking Amperes 1000 at 32 degrees Fahrenheit;
  • 12 Volts Nominal Voltage;
  • Voltage when fully charged without any load 13.1Volts;
  • Internal Resistance of 0.0025 ohms;
  • Reserve Capacity 140 minutes;
  • Capacity of 66Ah C/20;
  • Weight 53.8 pounds;
  • Dimensions 12.19 inches by 6.81 inches by 8.75 inches;

Important Features of  Optima 8027-127 D27M

The Optima 8027-127 can supply your RV’s starter motor with 800 amperes at zero degrees Celsius, for 30 seconds. When operated at a temperature of 32 degrees Fahrenheit, this battery can supply your RV’s cranking motor with 1000A for 30 seconds continuously. The difference is currently available for cranking is because batteries operate better at between 32 degrees and 80 degrees Fahrenheit than at zero degrees Fahrenheit.

This battery has a nominal voltage of 12 Volts. That is the voltage the cells will operate at for a while before it starts dropping to 10.5 volts. When fully charged and not yet connected to a load, this battery attains a voltage of 13.1 Volts.

With an internal resistance of 0.0025 ohms, this battery is efficient. The internal resistance is the opposition the current faces when flowing internally from the cell reaction to the terminal. The greater the internal resistance, the faster the battery will become hot when operating.

It has a reserve capacity of 140 minutes. That is the period the trolling motor can draw 25A of current at a temperature of 80 Degrees Fahrenheit without the voltage dropping below 10.5 Volts. This battery has a capacity of 66Ah C/20, which means if you draw current from it continuously for 20 hours, you will draw a total of 1320A.

Feature Benefits

The Optima 8027-127 is a dual-purpose battery that can be used as a cranking battery for your RV as well as a marine battery for your boat. It can supply you starting motor with 800 amperes at zero degrees Fahrenheit or 1000 amperes at 32 degrees Fahrenheit. If you use it as a trolling motor battery, you are guaranteed of 140 minutes reserve capacity.

That is close to two and a half hours of continuous trolling. With those facts in mind, you can see why this is one of the best trolling motor batteries as well as the best starting battery.

It is designed to charge faster than conventional lead acid batteries. That is achieved by using lead-tin alloy instead of pure lead. What the alloy does is it lowers the internal resistance of this battery’s cells. That allows it to take more recharge current to enable it to achieve its full capacity within a short period. If you do not exceed 14 Volts when recharging, this battery will not be damaged due to fast recharging.

Unlike conventional lead-acid batteries, this battery is sealed and vibration resistant. It can withstand 15 times more vibration than a regular battery. These two factors make this battery one of the perfect marine batteries to use for trolling in rough waters. You will not experience dimming lights that occur when batteries that are affected by vibrations are used in power lights.

You can mount this battery in virtually any position without worrying about spillage. This battery is also maintenance-free. Once you install it, all you have to do is use it and let it recharge in your spare time!

Things We Liked

  • Can be used as an RV starting or marine trolling battery;
  • Capable of more recharges than other lead-acid batteries;
  • Spill and leakproof;
  • Resistant to vibration;
  • Maintenance free;
  • Feature cell recombination technology;
  • Strong casing to protect against cracking;

Things We Didn’t Like

  • Heavier than lithium-ion batteries;
  • You must adhere to recharging limits to avoid damage;
  • Must not be exposed to excessive vibrations;

Can the Optima 8027-127 D27M Starting Battery Be Used in Extreme Temperatures

The Optima 8027-127 D27M Starting Battery is designed to operate in a wide range of temperatures, including extreme temperatures. However, it is important to note that the battery’s performance and lifespan may be affected by extreme temperatures, and it is always best to consult the manufacturer’s specifications and guidelines for proper usage in extreme temperature conditions.

Is the Optima 8027-127 D27M Starting Battery a Suitable Option for Deep Cycle Use?

When considering the Optima 8027-127 D27M Starting Battery, it’s essential to weigh the key considerations for deep cycle battery usage. While this battery is designed for starting applications, it may not have the capacity or durability required for prolonged deep cycle use. It’s important to research and compare options before making a decision.


Can I order this battery by air, land, or sea?

Yes. This battery is sealed and cannot leak or spill. That is the main reason planes can not transport some batteries. No regulations are barring it from being transported by sea or land.

Is quick recharging okay for this battery?

Yes, this battery can handle faster research. You must, however, keep the recharging voltage below 14 volts. You also have to stop if the battery overheats or you realize it feels hot while recharging.

Can I use any charger available?

No, It is best to use Optima’s recommended charger for the best recharging experience. You must also follow the user manual strictly when recharging.

Insider Tips

If you use this battery to power your RV or for trolling, invest in about four of them to create a battery bank. That will allow your RV onboard equipment or your trolling motor to draw current for long periods. If the batteries are arranged in series, it will also increase the voltage at your disposal. You can then trade the voltage for current when driving your trolling motor.


The Optima 8027-127 is the best marine deep-cycle battery. It features a CCA of 800 amperes, a CA of 1000, and a Reserve capacity of 140 minutes. It is a dual-purpose battery and is both spill and leak-proof. It is 15 times more resistant to vibrations. It is the best RV battery, and trolling motor battery can have its features.


When it comes to choosing the best battery, in most cases you have to choose between a cranking battery to supply your starting motor with enough amperes, and a trolling battery to power your trolling motor for long periods. 

The Optima 8027-127 D27M Starting Battery is a reliable and powerful battery that is suitable for a variety of applications. It has a long life and is resistant to vibration, making it an ideal choice for cars, boats, and other vehicles. It is built to last and can handle tough conditions. The battery is easy to install and use, and its sealed design ensures that it is maintenance-free. The Optima 8027-127 D27M Starting Battery is an excellent choice for anyone looking for a reliable and powerful battery.

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About This Writer

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Hi, I am responsible for the 'Homeowners Power Solutions' category. My name is Liam Jaxon and a licensed technician with 7 years of experience in vehicle batteries, electrical gadgets, and home appliances. My working experience in different residential & light commercial electrical sectors and the automobile industry helped to acquire vast knowledge in this industry.

Hi, I am responsible for the 'Homeowners Power Solutions' category. My name is Liam Jaxon and a licensed technician with 7 years of experience in vehicle batteries, electrical gadgets, and home appliances. My working experience in different residential & light commercial electrical sectors and the automobile industry helped to acquire vast knowledge in this industry.

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