---
product_id: 596888851
title: "3.7V 250mAh 402030 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Bluetooth Headset, Watch 2-Pack"
brand: "oxwinou"
price: "VT4814"
currency: VUV
in_stock: true
reviews_count: 8
category: "Oxwinou"
url: https://www.desertcart.vu/products/596888851-3-7v-250mah-402030-rechargeable-lithium-polymer-replacement-battery-diy
store_origin: VU
region: Vanuatu
---

# 250mAh High Capacity 3.7V Nominal Voltage Multi-layer Safety Protection 3.7V 250mAh 402030 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Bluetooth Headset, Watch 2-Pack

**Brand:** oxwinou
**Price:** VT4814
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your passion projects with safety and style!

## Quick Answers

- **What is this?** 3.7V 250mAh 402030 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Bluetooth Headset, Watch 2-Pack by oxwinou
- **How much does it cost?** VT4814 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.vu](https://www.desertcart.vu/products/596888851-3-7v-250mah-402030-rechargeable-lithium-polymer-replacement-battery-diy)

## Best For

- oxwinou enthusiasts

## Why This Product

- Trusted oxwinou brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Double the Value:** 2-pack ensures you’re always powered up and ready to go—never miss a beat.
- • **Compact Yet Mighty:** Slim 4×20×30.5mm size fits seamlessly into tight spaces without compromising power.
- • **Safety First, Always:** Built-in Japanese Seiko IC safeguards against overcharge, overdischarge, and short circuits.
- • **Plug & Play Flexibility:** Includes genuine JST 2-pin connector with heat-shrink sleeve for easy, secure wiring.
- • **Power Your DIY Projects with Confidence:** Reliable 3.7V output perfect for a wide range of 3.7-5V electronics.

## Overview

The OXWINOU 3.7V 250mAh 402030 rechargeable lithium polymer battery is a compact, high-capacity power solution designed for DIY electronics, Bluetooth headsets, GPS watches, and more. Featuring advanced Japanese Seiko IC protection and a genuine JST connector, it ensures safe, reliable performance in a slim form factor. Sold as a convenient 2-pack, it’s the perfect upgrade to keep your devices energized and ready.

## Description

Buy OXWINOU 3.7V 250mAh 402030 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Bluetooth Headset, Watch 2-Pack: 3.7V - desertcart.com ✓ FREE DELIVERY possible on eligible purchases

Review: Good Batteries. - Great for “Dead Rail” power on my model railroad.
Review: Cheap batteries - Delivery was late. New rechargeable batteries will not charge up. Use on a drone.

## Features

- This product is suitable for battery replacement of DIY 3.7-5v electronic products, mobile energy storage, power supply, LED light, wireless Bluetooth game headset, outdoor video and audio electronic scale, GPS Watch recorder, e-book, USB Fan tester, dash cam controller, mouse and keyboard.
- Please carefully compare the polarity of the connector before use,the red wire is the positive "+" and the black wire is the negative "-"，Do not reverse-charge or reverse-connectreverse. The primary battery of some products has no plug or mismatched plug or mismatched polarity. It doesn't matter, you can cut and solder the plug directly or use our heat shrinkable insulating sleeve to connect the same color wire.
- 402030 rechargeable lithium ion polymer battery, nominal voltage 3.7V, capacity 250mAh, power 0.92Wh, size 4×20×30.5mm(0.157×0.787×1.22inch）(T*W*L).
- It‘s consists of of large-capacity A+ lithium battery, Japanese Seiko IC overcharge and overcurrent short circuit protection board, 3302-26 high temperature resistant silicone cable, and genuine JST Pitch1.25mm 2-pin connector module.
- It can prevent overcharge, overdischarge, overcurrent, and short circuit.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0CKWZH5M4 |
| Batteries | 2 Lithium Ion batteries required. (included) |
| Best Sellers Rank | #144,688 in Health & Household ( See Top 100 in Health & Household ) #183 in 3.7V Batteries #758 in Coin & Button Cell Batteries |
| Customer Reviews | 3.9 3.9 out of 5 stars (51) |
| Date First Available | October 12, 2023 |
| Item Weight | 0.317 ounces |
| Item model number | 402030 |
| Manufacturer | OXWINOU |
| Package Dimensions | 2.32 x 1.85 x 0.75 inches |

## Product Details

- **Battery Capacity:** 250 Milliamp Hours
- **Battery Cell Composition:** Lithium Ion
- **Brand:** OXWINOU
- **Number of Batteries:** 2 Lithium Ion batteries required. (included)
- **Recommended Uses For Product:** Indoor/Outdoor

## Images

![3.7V 250mAh 402030 Rechargeable Lithium Polymer Replacement Battery for DIY 3.7-5V Electronic Product, Bluetooth Headset, Watch 2-Pack - Image 1](https://m.media-amazon.com/images/I/7136S98-KgL.jpg)

## Available Options

This product comes in different **Size** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good Batteries.
*by M***E on April 9, 2025*

Great for “Dead Rail” power on my model railroad.

### ⭐ Cheap batteries
*by R***R on April 10, 2024*

Delivery was late. New rechargeable batteries will not charge up. Use on a drone.

### ⭐⭐⭐⭐⭐ Compatible With The Wand Company's Star Trek Communicator
*by D***S on August 18, 2025*

I bought this for The Wand Company's Star Trek Communicator whose battery had completely died. No soldering required because the connector is already attached. It's not the same physical size as the original TWC's comm battery, but it is the same voltage and amperage. My communicator charges and operates correctly again!

## Frequently Bought Together

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*Product available on Desertcart Vanuatu*
*Store origin: VU*
*Last updated: 2026-03-09*