Flat Top Batteries

A Complete Guide to Flat Top Batteries for Flashlight Battery Packs

Flat top rechargeable batteries play a pivotal role in powering flashlight battery packs. These batteries are characterized by their flat terminals, designed for use in custom battery assemblies, including flashlight packs. They offer a cost-effective, reusable solution that reduces waste while delivering reliable power.

 
Why Choose Flat Top Batteries for Flashlights?

Flat top batteries are a preferred choice for assembling flashlight battery packs due to their versatility and compact design. Unlike button-top batteries with a protruding positive terminal, flat top batteries are designed for series or parallel configurations in battery packs, allowing for seamless connectivity.

Key Benefits of Flat Top Batteries

Custom Assembly: Their flat terminal design enables close stacking, making them ideal for compact battery packs.
Rechargeability: Both NiCd and NiMH flat top batteries are rechargeable, offering long-term cost savings and environmental benefits.
Variety of Sizes and Capacities: These batteries are available in a range of sizes and capacities to suit different flashlight requirements.
 
Common Flat Top Batteries for Flashlight Battery Packs

Here’s a breakdown of the most commonly used flat top batteries for flashlights, highlighting their capacities, applications, and advantages.

1. 2/3 AAA NiMH Flat Top Battery (320 mAh)

Specifications:
Capacity: 320 mAh
Size: 2/3 of a standard AAA battery
Applications:
Ideal for compact flashlights and small portable devices where space is limited.
Advantages:
Lightweight and compact design.
Reliable power for smaller devices requiring less energy.
The 2/3 AAA NiMH flat top battery balances portability and performance, making it a go-to option for mini flashlight battery packs.

 
2. Sub C NiCd Battery (1500 mAh)

Specifications:
Capacity: 1500 mAh
Size: Sub C
Applications:
Commonly used in larger flashlight models and medium-sized battery packs.
Advantages:
High durability and ability to withstand frequent charge/discharge cycles.
Balanced capacity and size make it versatile for various uses.
The Sub C NiCd battery is a workhorse for flashlight battery packs, offering dependable power and moderate capacity.

 
3. 2/3 A NiCd Battery (700 mAh)

Specifications:
Capacity: 700 mAh
Size: 2/3 of a standard A battery
Applications:
Suitable for mid-sized flashlights requiring compact but efficient batteries.
Advantages:
Compact form factor with a decent energy capacity.
Reliable performance in high-discharge scenarios.
This battery is an excellent choice for custom battery packs where space constraints exist, without compromising on power.

 
4. Sanyo (KR-1700AU) NiCd Flat Top Battery (1700 mAh)

Specifications:
Capacity: 1700 mAh
Brand: Sanyo
Applications:
Designed for high-discharge applications, including high-performance flashlights.
Advantages:
Long service life with excellent durability.
Superior performance in demanding conditions.
The Sanyo KR-1700AU is a premium option for users who require a robust and high-capacity solution for their flashlights.

 
5. 1/3 AAA Sanyo NiCd Flat Top Battery (50 mAh)

Specifications:
Capacity: 50 mAh
Size: 1/3 of a standard AAA battery
Applications:
Used in ultra-compact flashlights or devices needing minimal power.
Advantages:
Extremely small size for tight spaces.
Reliable power source for micro applications.
This battery is ideal for miniaturized electronic devices and micro flashlights.

 
6. 2/3 AA NiCd and NiMH Flat Top Batteries (400–700 mAh)

Specifications:
Capacity Range: 400–700 mAh
Size: 2/3 of a standard AA battery
Applications:
Versatile usage in a range of flashlight models.
Advantages:
Compact size with moderate capacity.
Available in both NiCd and NiMH chemistries for varied performance needs.
These batteries offer flexibility in assembling custom battery packs for mid-sized flashlights.

 
7. AAA NiMH Flat Top Battery (800 mAh)

Specifications:
Capacity: 800 mAh
Size: Standard AAA
Applications:
Ideal for flashlights requiring higher energy output over extended periods.
Advantages:
High capacity in a compact size.
Reliable power for energy-demanding devices.
With an 800 mAh capacity, this battery strikes a balance between size and power, making it a versatile choice for many flashlights.

 
8. 1/3 AA NiMH Flat Top Battery (300 mAh)

Specifications:
Capacity: 300 mAh
Size: 1/3 of a standard AA battery
Applications:
Perfect for mini flashlights and other portable devices with space limitations.
Advantages:
Compact and lightweight.
Provides adequate power for low-drain applications.
This battery is an excellent solution for small devices that require a compact power source.

 
Choosing the Right Flat Top Battery for Your Flashlight

When selecting a flat top battery for your flashlight battery pack, consider the following factors:

1. Battery Chemistry (NiCd vs. NiMH)

NiCd Batteries:
Better suited for high-discharge applications.
Longer lifespan in terms of charge/discharge cycles.
Prone to "memory effect," requiring complete discharge before recharging.
NiMH Batteries:
Higher capacity compared to NiCd.
More environmentally friendly, as they do not contain toxic cadmium.
Minimal memory effect, allowing for partial recharges.
2. Capacity Requirements

Choose a battery with sufficient capacity (measured in mAh) to meet your flashlight's energy demands. High-capacity batteries, like the Sanyo KR-1700AU, are ideal for long runtime and powerful flashlights.

3. Size and Form Factor

Ensure the battery size fits your flashlight or battery pack assembly. Smaller batteries, such as 2/3 AAA or 1/3 AA, are best for compact devices, while larger Sub C batteries suit high-power flashlights.

4. Durability and Lifespan

Consider the expected lifespan and durability of the battery. NiCd batteries are known for their robustness, while NiMH batteries excel in runtime and environmental friendliness.

 
Maintenance Tips for Flat Top Batteries

To maximize the performance and lifespan of your flat top batteries:

Proper Charging: Use chargers designed for NiCd or NiMH batteries to prevent overcharging or damage.
Storage Conditions: Store batteries in a cool, dry place to prevent capacity degradation.
Avoid Deep Discharges: While NiCd batteries can handle deep discharges, NiMH batteries perform better when partially discharged before recharging.
Inspect Regularly: Check for signs of corrosion or damage, and replace compromised batteries immediately.
 

Flat top batteries are a versatile and reliable choice for assembling flashlight battery packs. With options ranging from compact 2/3 AAA batteries to high-capacity Sub C and Sanyo models, there’s a flat top battery for every flashlight application. By selecting the right battery type, size, and capacity, you can ensure optimal performance and longevity for your flashlight, whether it's for emergencies, outdoor adventures, or daily use.