Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204) vs Craftsman V20 9.0Ah Lithium Ion Battery
Buy the 9.0Ah battery if you want the most runtime and the lowest price: $38.98 at eBay as of November 4, 2026, versus $50.00 at Amazon for the 4.0Ah. The 4.0Ah is the lighter, cheaper-to-own-per-pack option for light work and for tools where balance matters. Both are genuine Craftsman V20 packs that fit the same tools.
Today the Craftsman V20 9.0Ah Lithium Ion Battery costs $11.02 less at its best price.
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Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204)
Choose the 4.0Ah (CMCB204) if you want a lighter pack for drills and drivers used overhead or in tight spots, and you value the wider new-stock availability at five stores.
- Lighter in the hand for overhead and precision work
- Fits all V20 tools
- More stores carry it new
- Charges faster than the 9.0Ah
What separates them
| Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204) | Craftsman V20 9.0Ah Lithium Ion Battery | |
|---|---|---|
| Capacity | 4.0 Ah | 9.0 Ah (up to 6x a standard V20 pack) |
| Runtime under heavy load | Moderate; fine for drilling and driving | Extreme runtime for jobsite tools |
| Weight and balance | Lighter, keeps compact tools balanced | Heavier; makes compact drills nose-heavy |
| Best new price | $50.00 at Amazon as of November 4, 2026 | $38.98 at eBay as of November 4, 2026 |
| Stores pricing it new | 5 stores | 3 stores |
| Charge time | Shorter; smaller cell count fills faster | Longer; needs a fast charger to be practical |
| Platform fit | Craftsman V20 tools |
Price history
- Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204): lowest $50.00 on Nov 4 at Amazon.
- Craftsman V20 9.0Ah Lithium Ion Battery: lowest $34.99 on Nov 4.
Prices at every store
Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204)
- Buy & Sell OutletNew
In stockReturn policy
$50.00Verified - ZoroNew
In stock
$65.55Free shippingObserved at 12:15 PM - AmazonNew
Availability unknown
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$50.00Free shippingObserved at 12:16 PM - Lowe'sNew
Availability unknown
$59.00Free shippingObserved at 12:15 PM
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Specs compared
| Spec | Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204) | Craftsman V20 9.0Ah Lithium Ion Battery |
|---|---|---|
| UP TO 6X THE CAPACITY | — | Versus the standard CRAFTSMAN V20 lithium ion b… |
| EXTREME RUNTIME | — | For heavy-duty jobsite applications |
| POWER | — | Professional grade high energy cells |
What reviewers say
Craftsman V20 4.0-Amp Hour Lithium Ion Battery (CMCB204)
Owners of V20 tools generally rate the 4.0 Ah pack well for runtime and fit, and see it as the sensible upgrade from the 2.0 Ah kit battery. Complaints center on weight and on packs that fail early.
- Noticeably longer runtime than the 2.0 Ah pack
- Snaps into V20 tools and chargers without play
- Holds charge well between uses
- Adds noticeable weight to drills and drivers
- A minority report packs dying within a year
- Costs more than generic replacements
Craftsman V20 9.0Ah Lithium Ion Battery
Owners of Craftsman V20 tools generally rate the 9.0Ah pack well for runtime on saws, blowers and grinders. The common complaints are weight and longer charge times.
Questions and answers
- Which lasts longer on a charge?
- The 9.0Ah, by roughly double. It is rated at more than twice the capacity of the 4.0Ah pack, so it runs saws and blowers far longer between charges.
- Is the 9.0Ah worth it over the 4.0Ah?
- Yes for heavy tools. It also costs less right now: $38.98 at eBay versus $50.00 at Amazon as of November 4, 2026.
- Do both fit the same tools?
- Yes. Both are Craftsman V20 packs and fit the same V20 lineup of drills, saws and outdoor tools.
- Which is better for a drill?
- The 4.0Ah for balance and lighter weight, especially overhead. The 9.0Ah adds runtime but makes a compact drill nose-heavy.
- How long do these batteries last?
- Craftsman does not publish a cycle count for either pack. Lithium-ion packs typically degrade over several hundred charge cycles, and the larger pack does fewer cycles for the same work.