# RIDGID 18V 4.0 Ah Battery

*Published: 2026-01-24 | Updated: 2026-01-24 | Source: https://shopsavvy.com/products/ridgid-18v-4.0-ah-battery*

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**Brand:** RIDGID
**Price Range:** $50.79 across 1 retailers

## Pros
- The battery performs reliably and meets user expectations for consistent power delivery.
- Holds charge well, providing long-lasting usage time for tools.
- Compatible with multiple RIDGID 18V tools, making it a convenient choice for users invested in the brand.
- Easy to charge and dependable for repeated use.
- Many users appreciate having multiple batteries on hand due to its dependable performance.
- Solid build quality contributes to overall durability.
- Provides good value when purchased from authorized retailers.

## Cons
- Charging times can be lengthy, especially with the smaller charger included.
- Warranty coverage is limited unless purchased directly from Home Depot or RIDGID authorized sellers—Amazon purchases are not eligible for RIDGID’s lifetime warranty.
- Amazon listings often do not clearly disclose the warranty limitations, potentially causing confusion.
- Warranty registration and support can be difficult or inaccessible without a legitimate proof of purchase from an authorized seller.
- Buying from third-party sellers can save money upfront but risks voiding the lifetime service agreement.

## Specifications

| Attribute | Value |
|-----------|-------|
| model | R840040 |
| mpn | AC840040 |
| barcode | 648846056127 |
| sku | R840040 |
| capacity | 4.0 Ah |
| chemistry | Lithium-Ion |
| brand | RIDGID |
| voltage | 18V |

## Current Prices

| Retailer | Price | Availability |
|----------|-------|-------------|
| [retailers/amazon](https://shopsavvy.com/api/redirect/products/be7d51f3-4c7f-0a01-d398-16180edab703/offers/825fe911-c30e-90d1-3d94-6359b62a87e9?source=shopsavvy&medium=product-page) | $50.79  | Check |

[See every retailer and the full price history on ShopSavvy](https://shopsavvy.com/products/ridgid-18v-4.0-ah-battery)

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