# TLDR Review: DEWALT 18V to 20V Adapter

*Published: 2025-12-31 | Updated: 2025-12-31 | Source: https://shopsavvy.com/reviews-tldr/dewalt-18v-to-20v-adapter*

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## Product: DEWALT 18V to 20V Adapter
**Brand:** DEWALT

## Pros
- Enables use of 20V batteries with older 18V DeWalt tools, breathing new life into existing equipment
- Tools run stronger with 20V batteries than with original batteries, delivering noticeably better performance
- Significantly extends battery life compared to original batteries
- Securely fits with no compatibility issues and works reliably with all 18V tools
- Allows users to maintain a single charger and battery platform, eliminating the need for separate 18V and 20V systems
- Durable construction that withstands daily professional use
- Minimal added weight to tools in most applications
- Works flawlessly with all DeWalt 20V batteries to power 18V rotary laser levels

## Cons
- Can be difficult to remove once installed due to tight-fitting release buttons, making it challenging if you need to swap adapters between tools
- Increases tool length and weight, which may affect usability in certain applications like circular saws that have limited cutting depth (reduces maximum cut depth from 2-1/8" to 1-7/8")
- Not compatible with 18V work lights or nailers—tested units failed to function
- Cannot accommodate larger batteries (5Ah PowerStack, 6Ah XR, 8Ah XR, and 10Ah XR models), limiting you to smaller XR models
- Requires battery removal during storage to prevent slow discharge from adapter electronics
- May prevent door closure on certain rotary laser models (DW079KD or DW074KD), affecting water resistance
- Extremely difficult to install and remove during initial use, though it becomes easier after several cycles

## Bottom Line

If you've got a collection of older 18V DeWalt tools gathering dust, this adapter is a solid way to revive them without dropping serious cash on replacements—just know that you're getting better performance and battery life at the trade-off of slightly bulkier tools and some compatibility limitations. The adapter works reliably with most drills, saws, and rotary lasers, but steer clear if you're planning to use it with work lights or nailers. We'd recommend purchasing one adapter per tool since removal can be a pain, and always store without batteries installed to avoid slow discharge.

## Pros vs Cons at a Glance

| Pros | Cons |
|------|------|
| Enables use of 20V batteries with older 18V DeWalt tools, breathing new life into existing equipment | Can be difficult to remove once installed due to tight-fitting release buttons, making it challenging if you need to swap adapters between tools |
| Tools run stronger with 20V batteries than with original batteries, delivering noticeably better performance | Increases tool length and weight, which may affect usability in certain applications like circular saws that have limited cutting depth (reduces maximum cut depth from 2-1/8" to 1-7/8") |
| Significantly extends battery life compared to original batteries | Not compatible with 18V work lights or nailers—tested units failed to function |
| Securely fits with no compatibility issues and works reliably with all 18V tools | Cannot accommodate larger batteries (5Ah PowerStack, 6Ah XR, 8Ah XR, and 10Ah XR models), limiting you to smaller XR models |
| Allows users to maintain a single charger and battery platform, eliminating the need for separate 18V and 20V systems | Requires battery removal during storage to prevent slow discharge from adapter electronics |
| Durable construction that withstands daily professional use | May prevent door closure on certain rotary laser models (DW079KD or DW074KD), affecting water resistance |
| Minimal added weight to tools in most applications | Extremely difficult to install and remove during initial use, though it becomes easier after several cycles |
| Works flawlessly with all DeWalt 20V batteries to power 18V rotary laser levels |  |

## Current Prices

| Retailer | Price | Availability |
|----------|-------|-------------|
| The Home Depot | $39.00  | In Stock |
| Walmart | $39.00  | In Stock |
| Amazon | $39.99  | In Stock |
| Acme Tools | $53.99  | In Stock |
| Ace Hardware | $54.99  | In Stock |
| Newark | $57.86  | In Stock |
| Lowe's | $59.00  | In Stock |
| Global Industrial | $67.95  | In Stock |
| MSC Industrial Supply | $71.49  | In Stock |

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*About this review: We pulled together findings from professional and user reviews, and cross-referenced them with ShopSavvy's pricing data from thousands of retailers to give you the short version.*