Physical Address
304 North Cardinal St.
Dorchester Center, MA 02124
10 Best Battery Post Shims for Optimal Performance in 2025
When it comes to maintaining your vehicle’s battery connections, the best battery post shims are essential for ensuring a snug and reliable fit. Battery post shims help create a tighter seal between the battery terminals and cables, which can prevent corrosion and ensure optimal performance. In 2025, a plethora of options are available on Amazon, making it easier than ever to find the right product for your needs. This article will dive deep into the top ten battery post shims from Amazon in 2025, providing an in-depth look at their features, pros, and cons.
Top 10 Battery Post Shims
1. Deka Battery Post Shims
- Package Details: You will get 2 pieces of battery post shims, there are 2 styles of large and small for you to choose, which can well solve the problems of battery post and terminal wear and poor battery matching.
- Awesome Material: This battery post shim is mainly made of reliable lead material, which is strong and durable, has good toughness, ductility and conductivity, and will not be easily damaged, bringing you better use experience and safety.
- Size Details: The size of the large battery post shim is 1.9x1.9x1.5cm/0.75x0.75x0.59in, and the size of the small battery post spacer is 1.5x1.5x1.5cm/0.59x0.59x0.59in, fine workmanship and will not take up too much space.
- Easy Operation: You can easily install our product by simply placing it on the battery terminals and connection terminals, without modification, cutting or drilling, which brings you convenience.
- Widely Used: This battery post shim is widely suitable for most cars, and can be used for top column batteries or cables and side column batteries or cables, with strong versatility.
Deka offers a great set of battery post shims that are both durable and effective. Designed from a corrosion-resistant material, these shims create a solid connection that stands up to vibrations. The set includes multiple thicknesses for versatile applications, making them suitable for both automotive and marine batteries.
Pros:
- Corrosion-resistant material.
- Multiple thicknesses for versatility.
- Strong hold against battery vibrations.
Cons:
- May require some adjustment for perfect fit.
- Thicker options might not fit all battery terminals.
2. BAP Automotive Battery Terminal Shims
- Package Details: You will get 2 pieces of battery post shims, there are 2 styles of large and small for you to choose, which can well solve the problems of battery post and terminal wear and poor battery matching.
- Awesome Material: This battery post shim is mainly made of reliable lead material, which is strong and durable, has good toughness, ductility and conductivity, and will not be easily damaged, bringing you better use experience and safety.
- Size Details: The size of the large battery post shim is 1.9x1.9x1.5cm/0.75x0.75x0.59in, and the size of the small battery post spacer is 1.5x1.5x1.5cm/0.59x0.59x0.59in, fine workmanship and will not take up too much space.
- Easy Operation: You can easily install our product by simply placing it on the battery terminals and connection terminals, without modification, cutting or drilling, which brings you convenience.
- Widely Used: This battery post shim is widely suitable for most cars, and can be used for top column batteries or cables and side column batteries or cables, with strong versatility.
BAP’s automotive battery terminal shims are specially designed to fit a wide range of vehicle batteries. Made from high-grade metals, they provide excellent conductivity while minimizing resistance. The set includes both standard and oversized shims, making it a versatile option for DIY enthusiasts.
Pros:
- High conductivity for better performance.
- Includes multiple sizes for various applications.
- Durable construction for long-lasting use.
Cons:
- Some users may find them too thin for their needs.
- Not resistant to corrosion.
3. Fastronix Adjustable Battery Shims
- Package Details: You will get 2 pieces of battery post shims, there are 2 styles of large and small for you to choose, which can well solve the problems of battery post and terminal wear and poor battery matching.
- Awesome Material: This battery post shim is mainly made of reliable lead material, which is strong and durable, has good toughness, ductility and conductivity, and will not be easily damaged, bringing you better use experience and safety.
- Size Details: The size of the large battery post shim is 1.9x1.9x1.5cm/0.75x0.75x0.59in, and the size of the small battery post spacer is 1.5x1.5x1.5cm/0.59x0.59x0.59in, fine workmanship and will not take up too much space.
- Easy Operation: You can easily install our product by simply placing it on the battery terminals and connection terminals, without modification, cutting or drilling, which brings you convenience.
- Widely Used: This battery post shim is widely suitable for most cars, and can be used for top column batteries or cables and side column batteries or cables, with strong versatility.
The Fastronix adjustable battery shims are noteworthy for their flexibility. Engineered to be easily adjustable, these shims are perfect for those who frequently switch out batteries or work with different vehicles. The construction allows for a foolproof fit while providing excellent resistance to corrosion.
Pros:
- Easy adjustability for various battery sizes.
- Corrosion-resistant.
- Great for frequent battery changes.
Cons:
- May not fit securely on all battery terminal designs.
- Can be pricier than standard shims.
4. ACDelco Battery Post Connector Shims
−$0.50
- Package Content: Includes 4 pack Battery Post Shims Cap.
- Function: For worn, damaged or undersized battery terminals.
- Advantage: Easily replace the top terminal of the vehicle battery and increase the diameter of the connector bar to ensure a secure fit.
- Application: Practical tools for a variety of devices with batteries, widely used in ships, boats, small yachts, RVs, trucks, cars, vehicles, etc.
Known for their high-quality automotive parts, ACDelco’s battery post connector shims are no exception. These are designed to easily fit various battery sizes, ensuring a secure connection. Made from a solid metal alloy, these shims ensure minimal wear and long-term reliability.
Pros:
- High-quality metal alloy for durability.
- Compatible with a variety of battery sizes.
- Excellent wear resistance.
Cons:
- May require professional installation for some users.
- Not as adjustable as other models.
5. EZ Clamp Battery Terminal Shims
- Compatible: for car, vehicle, RV and boat, preferable fit for standard top post battery (19 mm cone/tapering positive & 17 mm cone/tapering negative).
- Purpose: shims used for repair of worn, damaged or undersized battery posts, provide a steady secure conductive electrical connection of terminals.
- TRIMMING To FIT: LEAD shim thickness is 0.5 mm +/- (flexible and easy to trimming), the shim can complete cover the 19 mm cone/tapering top post battery positive, NEED to TRIMMING To FIT the posts need to repair.
- Fiber Washers: to prevent corrosion around the battery terminals, prolong battery life.
- Package Includes: 10 piece SAME size battery post terminal lead shims, 12 piece (6 pairs red/black) battery terminal anti corrosion fiber washers.
EZ Clamp’s battery terminal shims are renowned for their ease of use. Designed to fit snugly over battery terminals, these shims can be quickly installed without the need for additional tools. Their unique design minimizes potential corrosion and improves connectivity.
Pros:
- Easy installation without tools.
- Minimizes corrosion for better performance.
- Snug fit enhances connectivity.
Cons:
- Limited adjustment options.
- May not fit oversized terminals.
6. MOTOALL Battery Terminal Shims
- Compatible: for car, vehicle, RV and boat, preferable fit for standard top post battery (19 mm cone/tapering positive & 17 mm cone/tapering negative).
- Purpose: shims used for repair of worn, damaged or undersized battery posts, provide a steady secure conductive electrical connection of terminals.
- TRIMMING To FIT: LEAD shim thickness is 0.5 mm +/- (flexible and easy to trimming), the shim can complete cover the 19 mm cone/tapering top post battery positive, NEED to TRIMMING To FIT the posts need to repair.
- Fiber Washers: to prevent corrosion around the battery terminals, prolong battery life.
- Package Includes: 10 piece SAME size battery post terminal lead shims, 12 piece (6 pairs red/black) battery terminal anti corrosion fiber washers.
MOTOALL’s battery terminal shims are specifically designed for those concerned about corrosion and long-term conductivity. They feature a rubberized coating that prevents rust and deterioration while ensuring a solid grip on battery terminals. Additionally, they come in multiple sizes to fit various battery types.
Pros:
- Rubberized coating for corrosion prevention.
- Multiple sizes for compatibility with different batteries.
- Solid grip ensures a secure fit.
Cons:
- Can be bulky for some applications.
- Some users may struggle with fitting them on thinner terminals.
7. T-H Marine Battery Post Shims
−$4.53
- SECURE FIT: Easily replace your vehicle batterys top terminals and increase the post diameter for a secure fit
- PAIR: Battery post shims for a better fit
- Increase post diameter for a secure fit
- Battery Post Shims
T-H Marine battery post shims are particularly useful for marine applications. Designed to withstand harsh weather conditions, these shims offer durability in any environment. Made from advanced composite materials, they prevent corrosion and ensure a stable connection for boats and other marine vehicles.
Pros:
- Durable for use in harsh marine environments.
- Prevents corrosion effectively.
- Good fit for marine batteries.
Cons:
- Not suitable for automotive batteries.
- A bit pricier compared to standard shims.
8. KINEK Battery Terminal Shim Set
- Specially designed for battery column damage, the Universal 10PCS Car Battery Post Terminal Shims Kit with Washers is a reliable solution for terminal end repair.
- Package includes:You will receive 10pcs silver battery post terminal shims(5 positive poles + 5 negative poles) and 12pcs washers(6 red+6 green), enough for your daily use and replacement. Please refer to the size details before purchasing.
- With a wide application range, this kit is suitable for various car models and battery sizes.
- Easy to install design allows for quick and hassle-free repairs, saving you time and effort.
- Constructed from durable materials, these shims and washers are built to last, providing long-lasting performance and reliability.
KINEK’s battery terminal shim set offers a variety of thickness options to help users achieve the perfect fit for their vehicle’s battery terminals. Made from high-quality aluminum, these shims not only enhance conductivity but also resist corrosion effectively.
Pros:
- Variety of thickness options.
- High-quality aluminum construction.
- Good conductivity and corrosion resistance.
Cons:
- Installation can be tricky for beginners.
- Some reviews mention inconsistencies in sizing.
9. Seachoice Battery Shims
- Package Details: You will get 2 pieces of battery post shims, there are 2 styles of large and small for you to choose, which can well solve the problems of battery post and terminal wear and poor battery matching.
- Awesome Material: This battery post shim is mainly made of reliable lead material, which is strong and durable, has good toughness, ductility and conductivity, and will not be easily damaged, bringing you better use experience and safety.
- Size Details: The size of the large battery post shim is 1.9x1.9x1.5cm/0.75x0.75x0.59in, and the size of the small battery post spacer is 1.5x1.5x1.5cm/0.59x0.59x0.59in, fine workmanship and will not take up too much space.
- Easy Operation: You can easily install our product by simply placing it on the battery terminals and connection terminals, without modification, cutting or drilling, which brings you convenience.
- Widely Used: This battery post shim is widely suitable for most cars, and can be used for top column batteries or cables and side column batteries or cables, with strong versatility.
Seachoice battery shims are particularly well-regarded among marine enthusiasts. With a focus on durability, these shims are crafted to withstand extreme conditions while providing a secure connection to battery terminals. Their unique design allows for easy installation and removal.
Pros:
- Exceptionally durable for marine environments.
- Easy installation.
- Good grip on battery terminals.
Cons:
- Sometimes challenging to find the right size.
- Not compatible with automotive applications.
10. ROLLY Battery Terminal Shims
- Package Details: You will get 2 pieces of battery post shims, there are 2 styles of large and small for you to choose, which can well solve the problems of battery post and terminal wear and poor battery matching.
- Awesome Material: This battery post shim is mainly made of reliable lead material, which is strong and durable, has good toughness, ductility and conductivity, and will not be easily damaged, bringing you better use experience and safety.
- Size Details: The size of the large battery post shim is 1.9x1.9x1.5cm/0.75x0.75x0.59in, and the size of the small battery post spacer is 1.5x1.5x1.5cm/0.59x0.59x0.59in, fine workmanship and will not take up too much space.
- Easy Operation: You can easily install our product by simply placing it on the battery terminals and connection terminals, without modification, cutting or drilling, which brings you convenience.
- Widely Used: This battery post shim is widely suitable for most cars, and can be used for top column batteries or cables and side column batteries or cables, with strong versatility.
ROLLY offers an innovative range of battery terminal shims that are known for their compatibility with various types of batteries. Their unique design focuses on enhancing the lifespan of battery connections, while also providing excellent conductivity. Each shim is crafted from durable materials to ensure reliable performance.
Pros:
- Compatible with various battery types.
- Enhances connection lifespan.
- Durable construction.
Cons:
- Limited adjustability.
- Some sizes may be hard to find.
Buying Guide for Battery Post Shims
Battery post shims are essential components used to ensure a secure and reliable connection between battery terminals and cables. Understanding the key features, materials, and considerations when purchasing battery post shims is crucial for optimal performance. This guide will help you choose the right shims for your needs.
1. Material
- Copper: Known for excellent conductivity, copper shims are durable and resistant to corrosion. They are ideal for high-performance applications.
- Lead: Often used for their weight and malleability, lead shims offer good conductivity but can be less durable in certain environments.
- Plastic/Nylon: Non-conductive shims. While they won’t conduct electricity, they can provide space adjustments and insulation.
2. Size and Compatibility
- Post Diameter: Ensure the shim fits your specific battery post size. Common sizes include 3/8”, 5/16”, and 1/4”.
- Thickness: Choose a shim thickness that allows for the correct fit without compromise to the connection. Common thicknesses range from 0.1mm to 1mm.
- Shape: Most shims are circular; however, some may come in various shapes to accommodate different designs.
3. Purpose and Application
- Standard Use: For general applications, standard battery post shims will suffice.
- Performance Needs: If you’re dealing with high-performance vehicles or equipment, opt for high-quality copper options to ensure maximum conductivity and reliability.
4. Quantity
- Consider purchasing shims in bulk or as single pieces. Many brands offer packages that include multiple pieces, which can be useful for automotive or marine applications.
5. Corrosion Resistance
- Choose shims that offer corrosion resistance, especially if used in humid or corrosive environments. Look for anodized or coated options that resist moisture and chemicals.
6. Price
- Battery post shims can vary in price. Generally, expect to pay anywhere from $5 to $30, depending on the material, brand, and quantity. Higher-priced options may offer better durability and performance.
7. Brand Reputation
- Research brands for reliability and customer reviews. Well-known automotive and electrical brands typically provide consistent quality.
8. Ease of Installation
- Ensure the shims you choose are easy to install. Some shims may come with additional tools or instructions, providing extra convenience.
9. Where to Buy
- Local Auto Parts Stores: Great for getting immediate assistance and expert advice.
- Online Retailers: Websites like Amazon, eBay, or specialized automotive websites offer a wide array of choices and customer reviews.
- Wholesale Distributors: If purchasing in bulk for commercial use, consider wholesale options.
Conclusion
When selecting battery post shims, consider your specific requirements, including the vehicle type, environmental factors, and the desired level of conductivity. By paying attention to the material, size, quantity, and brand reputation, you can make an informed and effective choice that ensures a secure connection and optimal performance for your battery.
