3.7V 600mAh Rechargeable RC Battery Pack 2-Pack with USB Charger

In this review the reviewer tested the Blomiky 2 Pack 3.7V 600mAh battery kit to judge whether it is a practical replacement for small RC toys and robotic dogs. The bottom line: this two-pack delivers the most important thing users need - straightforward, compatible replacement power in a compact package that matches SM-2P plug devices. For owners of Leneng K9-style robot dogs, small dump trucks, or other toys that use the same 52 x 34 x 5.5mm battery form factor, this kit provides an easy swap and a simple USB charging option so playtime returns quickly.

Key Features

• Compatibility: The SM-2P connector and 52 x 34 x 5.5mm footprint make these batteries fit many small RC robotic dogs and dump trucks that use the same plug and size.
• Capacity: Each 3.7V 600mAh Li-ion pack gives modest runtime appropriate for toys and small drones, extending play without oversized weight.
• Included charging solution: Two USB charger cables with SM-2P plugs are included so you can recharge without buying separate adapters.
• Compact size: At about 2.0 x 1.34 x 0.22in the batteries are thin and light, so they slide into toy compartments designed for the 523450 style cells.
• Charging indicator: The charger shows a red light while charging and the red light turns off when fully charged, making it easy to know when the pack is ready.

Who It's For

This kit is best for owners of small RC toys and robotic dogs that accept a 3.7V pack with an SM-2P connector and roughly 52 x 34 x 5.5mm dimensions, such as the Leneng K9 and similar models. It suits parents, hobbyists, and casual users who want an affordable spare battery set with USB charging ready to use right away.

Users who need very long runtimes, high-discharge packs for powerful RC cars, or a different connector type should look elsewhere. This is not targeted at large scale hobby vehicles or devices that require custom battery management systems.

Pros & Cons

Pros

• Direct compatibility with SM-2P plug toys makes installation straightforward and reduces downtime.
• Two batteries plus two USB charger cables give immediate backup power without extra purchases.
• Compact 523450 form factor keeps weight low and fits snugly into designed compartments.
• Clear charging indicator simplifies knowing when a pack is fully charged.

Cons

• 600mAh capacity is modest, so runtime between charges is limited for active toys.

Specifications

Brand	Blomiky
Battery type	3.7V Li-ion / Li-po
Capacity	600mAh
Connector	SM-2P plug
Dimensions	52 x 34 x 5.5mm (2.0 x 1.34 x 0.22in)
Included	2 batteries and 2 USB charger cables with SM-2P

Our Verdict

The Blomiky 2 Pack 3.7V 600mAh kit is a sensible, value-oriented choice for people who own small RC robotic dogs and similar toys that require an SM-2P 523450 battery. It restores play quickly with two batteries and USB chargers included, and the clear charging indicator is convenient. If you need higher capacity for extended sessions, consider larger packs, but for routine replacements this set is practical and well priced.

Frequently Asked Questions

Will these batteries fit my robot dog?
They fit devices that use a 3.7V 523450 style battery with an SM-2P connector and similar dimensions; check your battery size and plug to confirm.

How do I know when the battery is fully charged?
The USB charger shows a red light while charging and the red light turns off when the pack is fully charged.

Are two charger cables included?
Yes, the package includes two USB charger cables with SM-2P plugs so both batteries can be charged without extra purchases.