---
product_id: 385866100
title: "FirstPower 4.8Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038"
brand: "firstpower"
price: "¥16737"
currency: JPY
in_stock: true
reviews_count: 8
category: "First Power"
url: https://www.desertcart.jp/products/385866100-firstpower-4-8ah-14-4v-dw9091-battery-compatible-with-dewalt
store_origin: JP
region: Japan
---

# 14.4V Power Output 3.7Ah High Capacity Built-in Safety Protections FirstPower 4.8Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038

**Brand:** firstpower
**Price:** ¥16737
**Availability:** ✅ In Stock

## Summary

> 🔋 Power up your legacy tools with confidence and never miss a beat!

## Quick Answers

- **What is this?** FirstPower 4.8Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038 by firstpower
- **How much does it cost?** ¥16737 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/385866100-firstpower-4-8ah-14-4v-dw9091-battery-compatible-with-dewalt)

## Best For

- firstpower enthusiasts

## Why This Product

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

## Key Features

- • **Long-Lasting Power Boost:** Upgraded 3.7Ah Ni-MH cells deliver extended runtime for demanding projects.
- • **Safe & Stable Performance:** Advanced protection against overcharge, overheating, and short circuits ensures reliability.
- • **Trusted Quality & Support:** Backed by 1-year warranty and 30-day money-back guarantee for peace of mind.
- • **Seamless Dewalt Compatibility:** Perfect fit for Dewalt 14.4V XRP tools and chargers—no more charging hassles.
- • **No Memory Effect, Always Ready:** Charge or discharge anytime without losing battery capacity—work uninterrupted.

## Overview

The FirstPower 3.7Ah 14.4V DW9091 Battery is a premium Ni-MH replacement pack designed for Dewalt 14.4V XRP cordless tools. Featuring upgraded high-capacity cells, built-in safety protections, and no memory effect, it ensures longer runtime and stable performance. Compatible with a wide range of Dewalt models, it offers a hassle-free fit and reliable power backed by a 1-year warranty and 30-day return policy.

## Description

desertcart.com: FirstPower 3.7Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038 : Tools & Home Improvement

Review: Good replacement batteries for old DeWalt tools - I bought these after sending back Vanon 4.8Ah hour batteries that didn't fit the DeWalt charger well and one of the batteries gave the "bad battery signal." See my review for that product. These batteries are only 3.7Ah, but I'm very pleased with them. I did not have to force them into the DeWalt charger and pry them back out. I used them for a fairly big job, using 1 1/4" screws to re-attach drywall to a ceiling hung on 70 year-old very hard trusses. This required a lot of energy from the battery, particularly for the last 1/2" of each screw. There were probably something like 150 screws. I used one battery on the first day and the second battery the next day. Neither battery seemed to have lost enough charge to be noticeable. If you have old DeWalt 14.4 volt tools you want to continue using, I recommend these batteries. The price is very reasonable. I would say that DeWalt tools have come a long way over the years, and rather than get new 14.4 batteries, you might want to consider new tools, but for occasional jobs, these batteries will keep your old tools working.
Review: A perfect fit to replace the original battery pack. They work right, period. - These worked perfect in my Dewalt drill. They fit right and even came charged. Very happy.

## Features

- 【Battery Features】: 14.4V / 3.7Ah / Ni-Mh. No Memory Effect, not hot when charge. Tested by manufacturer to match Dewalt & OEM product.
- 【Compatible with DEWALT 14V Tools & Charger 】: E.g: DEWALT DC984, DC9091, DC730KA, DC930KA, DCD920KX, DCD930KX, DW935, DW954, DW941K-2, DW9091, DW9094, DE9091, DE9038, DE9095...
- 【3.7Ah Higher Capacity】: Upgraded to 3.7Ah higher capacity battery with higher quality cells for long-lasting performance. 3.7Ah Higher capacity offering long-lasting performance and durability than other 4.0Ah.
- 【Safe & Stable】: No Memory Effect, Can be charged or discharged as needed without loss of capacity . Top A grade NI-MH Battery Cells, Built-in protection against potential damage caused by overcharging, overheating and short-circuit protection.
- 【High Quality XRP Battery】: High-capacity XRP battery has 40 percent more run-time than standard batteries. Easy to use & handle. 30 days money back, 1 Year Warranty, 24 hours service.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B09LH5ZWF8 |
| Amperage | 3.7 Amps |
| Antenna Location | Power Tool |
| Battery Capacity | 3.7 Amp Hours |
| Battery Cell Composition | NiMH |
| Battery Cell Type | NiMH |
| Best Sellers Rank | #86,960 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #815 in Cordless Tool Battery Packs |
| Brand | FirstPower |
| Customer Reviews | 4.4 out of 5 stars 435 Reviews |
| Item Dimensions | 7.5 x 5.7 x 3.8 inches |
| Manufacturer | Shenzhen Lepower Electronic Co.,Ltd. |
| Model Number | DC9091 |
| Number of Batteries | 2 Product Specific batteries required. (included) |
| Recommended Uses For Product | Power Tool |
| Reusability | Rechargeable |
| Unit Count | 2 Count |
| Voltage | 14.4 Volts |
| Warranty Description | 1 Year |

## Product Details

- **Battery Capacity:** 3.7 Amp Hours
- **Battery Cell Composition:** NiMH
- **Brand:** FirstPower
- **Number of Batteries:** 2 Product Specific batteries required. (included)
- **Recommended Uses For Product:** Power Tool

## Images

![FirstPower 4.8Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038 - Image 1](https://m.media-amazon.com/images/I/61McUXf-bXL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Good replacement batteries for old DeWalt tools
*by D***G on April 21, 2025*

I bought these after sending back Vanon 4.8Ah hour batteries that didn't fit the DeWalt charger well and one of the batteries gave the "bad battery signal." See my review for that product. These batteries are only 3.7Ah, but I'm very pleased with them. I did not have to force them into the DeWalt charger and pry them back out. I used them for a fairly big job, using 1 1/4" screws to re-attach drywall to a ceiling hung on 70 year-old very hard trusses. This required a lot of energy from the battery, particularly for the last 1/2" of each screw. There were probably something like 150 screws. I used one battery on the first day and the second battery the next day. Neither battery seemed to have lost enough charge to be noticeable. If you have old DeWalt 14.4 volt tools you want to continue using, I recommend these batteries. The price is very reasonable. I would say that DeWalt tools have come a long way over the years, and rather than get new 14.4 batteries, you might want to consider new tools, but for occasional jobs, these batteries will keep your old tools working.

### ⭐⭐⭐⭐⭐ A perfect fit to replace the original battery pack. They work right, period.
*by G***N on September 22, 2025*

These worked perfect in my Dewalt drill. They fit right and even came charged. Very happy.

### ⭐⭐⭐⭐ Works okay so far in limited use.
*by R***A on June 16, 2025*

The batteries fit my power drill although it is a bit of a tight fit. So far the charge seems to be holding, which was the problem of my original batteries which failed to hold a charge.

## Frequently Bought Together

- FirstPower 3.7Ah 14.4V DW9091 Battery - Compatible with Dewalt 14.4V Battery XRP Cordless Power Tool - Upgraded Ni-MH DC9091 DW9091 DW9094 DE9091 DE9092 DE9038
- DC9310 Fast Charger Replace for DEWALT 18 Volts Battery Charger DW9116 Compatible with Dewalt 7.2V-18V Battery XRP NiCD/NiMH Battery DC9098 DC9096 DC9091 DE9057 DW9072(Not for Lithium Battery)
- 18V Replacement Battery for DeWALT: 18 Volt 5.0Ah XRP DC9096 Ni-Mh Batteries Compatible with DC9098 DC9099 DW9095 DW9096 DW9098 Cordless Power Tools

---

## Why Shop on Desertcart?

- 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016
- 🌍 **Shop Globally** — Access 737+ million products across 21 categories
- 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price
- 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members)
- 🔒 **Secure Payments** — Trusted payment options with buyer protection
- ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews

**Shop now:** [https://www.desertcart.jp/products/385866100-firstpower-4-8ah-14-4v-dw9091-battery-compatible-with-dewalt](https://www.desertcart.jp/products/385866100-firstpower-4-8ah-14-4v-dw9091-battery-compatible-with-dewalt)

---

*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-03-15*