KAB-BE 18650 Battery Extension Board for Bluetooth Amps - Portable

In this review the Dayton Audio KAB-BE 18650 battery extension board is assessed as a practical power accessory for portable audio builders who want a neat, rechargeable battery solution. The bottom line: it is for hobbyists and DIY audio makers who need a compact way to add three 18650 Li-Ion cells to a KAB Bluetooth amplifier and want built-in safety features. Our review finds the KAB-BE most valuable because it combines charging capability, under/over voltage protection and cell balancing in a single plug-in board designed to connect directly to KAB amp boards.

Key Features

• Under/over voltage protection: Prevents overcharging and protects batteries from harmful voltage extremes so the pack lasts longer and is safer to use.
• Voltage balancing: Keeps all three cells at similar charge levels so the amplifier remains powered even if one cell is weaker than the others.
• Three 18650 capacity: Holds three 18650 Li-Ion batteries, offering extended runtime compared with single-cell solutions when paired with a KAB amp board.
• Direct plug-in cable: Built-in 8in 4-conductor cable plugs directly into Dayton Audio KAB Bluetooth amplifier boards for a tidy, tool-free connection.
• Compact integration: The board combines charging and protection circuits in a small package suitable for portable sound projects and custom enclosures.

Who It's For

The KAB-BE is aimed at DIY audio builders, hobbyists and installers who already use Dayton Audio KAB Bluetooth amplifier boards and want a removable, rechargeable battery pack option. It is ideal for portable speaker projects, demo units, or anywhere a tidy three-cell Li-Ion power source is needed.

Those who should look elsewhere include users who need an integrated battery pack with cells included or plug-and-play consumer speakers; the KAB-BE is a board-only solution and requires three 18650 cells to be purchased separately and installed by the user.

Pros & Cons

Pros

• Built-in under/over voltage protection gives safer charging and discharging for user-supplied 18650 cells.
• Voltage balancing improves runtime stability and reduces the chance of one weak cell causing shutdowns.
• Direct 8in 4-conductor cable allows fast, clean connection to compatible KAB Bluetooth amp boards.
• Compact design fits neatly into portable audio builds without bulky external chargers.

Cons

• Requires separate 18650 Li-Ion batteries, so additional purchase and cell mounting are necessary before use.
• Intended specifically for KAB series amplifier boards, so compatibility is limited to those systems.

Specifications

Product	Battery extension/charging board for KAB Bluetooth amps
Battery type	Three 18650 Li-Ion cells (sold separately)
Protection	Under and over voltage protection
Balancing	Voltage balancing across the three cells
Cable	Built-in 8in 4-conductor cable
Compatibility	Plugs directly into Dayton Audio KAB Bluetooth amp boards

Our Verdict

The KAB-BE is a sensible, value-minded accessory for anyone building portable sound systems with Dayton Audio KAB Bluetooth amplifier boards. It combines charging, protection and balancing in a compact board that keeps projects tidy and batteries healthier over time. Buy it if you supply your own 18650 cells and need a clean, compatible battery option for KAB-based builds.

Frequently Asked Questions

Does the board include batteries?
The KAB-BE does not include batteries; it holds three 18650 Li-Ion cells which must be purchased separately.

Will it connect to other amplifier boards?
It is designed to plug directly into Dayton Audio KAB Bluetooth amplifier boards using the built-in 8in 4-conductor cable, so compatibility with other amps is not guaranteed.

Does the board charge and balance cells?
Yes, the board provides charging with under/over voltage protection and voltage balancing across the three cells to maintain runtime stability.