Retevis RT21 RT21V Replacement Battery 1100mAh Li-ion (5 Pack)

In this review the Retevis RT21 RT21V replacement battery pack is examined for users who rely on two-way radios for extended shifts and frequent outings. The bottom line: this five-pack of 1100mAh Li-ion batteries is best for teams and individuals who need dependable spare cells to keep RT21 or RT21V radios running without interruption. It stands out as a practical backup solution that extends operating time and reduces downtime, making it a sensible choice for security, events, and outdoor work where continuous radio use matters.

Key Features

• Rechargeable replacement battery: Provides a direct substitute for original cells so radios can be returned to service quickly without reprogramming or adapters.
• 1100mAh Li-ion capacity: Offers higher capacity than many single-use options, delivering longer run times between charges for typical radio use.
• 3.7V nominal voltage: Matches the radios requirements to ensure safe, compatible power delivery during operations.
• Lightweight and portable: At about 68g per battery, the pack is easy to carry as spares for long shifts or for packing into a kit for events and outdoor activities.
• Designed for specific models: Customized to fit only Retevis RT21 and RT21V two-way radios, which avoids loose connections and fit issues.
• Multiple spare batteries: The five-pack format keeps several radios active simultaneously or supplies backups for teams working across shifts.

Who It's For

The Retevis replacement pack suits security teams, event staff, paintball and outdoor groups, and businesses like restaurants or hotels that use RT21/RT21V radios and need reliable spare power. It is particularly useful where continuous communication is critical and quick battery swaps reduce operational interruptions.

Those who should look elsewhere include buyers who need universal battery solutions for many radio models or users who require batteries with substantially longer runtimes than 1100mAh can offer for extremely high-duty-cycle use. Also, it is not intended for radios other than the RT21/RT21V family.

Pros & Cons

Pros

• Offers reliable replacement power to keep RT21/RT21V radios running during long events or shifts.
• Five batteries in a pack reduce the need to recharge during multi-person operations and serve as practical spares.
• Lightweight 68g units are easy to carry and swap in the field without adding significant bulk.

Cons

• Capacity is 1100mAh, which is solid but not ultra-high; very heavy radio users may need extra spares or frequent recharging.

Specifications

Battery type	Li-ion
Voltage	3.7V
Capacity	1100mAh
Quantity	5 pack
Weight (each)	About 68g
Compatible models	Retevis RT21, RT21V

Our Verdict

The five-pack of Retevis RT21 RT21V 1100mAh batteries is a practical, cost-effective way to keep a fleet of RT21 radios active through long shifts and events. It is good value for teams that need simple, reliable spares tailored to these models, offering straightforward compatibility and easy portability for security, hospitality, and outdoor use.

Frequently Asked Questions

Are these batteries compatible with other radio models?
They are designed specifically for Retevis RT21 and RT21V radios and fit those models; they are not guaranteed to fit or be safe with other radios.

How long do the batteries typically last on a charge?
With 1100mAh capacity, expect several hours of active use depending on transmit duty cycle; the pack is intended to provide 3-4 hours of charging use scenarios and extended runtime when used as spares.

Is a special charger required?
No special charger is required beyond the charger compatible with RT21/RT21V batteries and radio charging accessories; these are standard Li-ion replacement cells matched to the radio charging design.