If you need a Craftsman V20 charger for your CMCB204 4.0 Ah battery, the direct answer is: the charger you want is the Craftsman CMCB104. But there is a small mystery on Craftsman’s own product page that is worth knowing before you set a timer.
Craftsman’s official CMCB104 charger page repeats the same claim three times in different places: the charger will “Fully charge a compact battery in 60 minutes or less,” “Charges CRAFTSMAN 20V MAX lithium compact batteries in 60 minutes or less,” and “Charges V20 2.0ah lithium ion batteries in 60 minutes or less.” That sounds consistent. Then, in the same page’s specifications table, the listed “Charge Time: 30.0-min” appears, with no battery capacity attached and no explanation of how it relates to the repeated “60 minutes” language.
We are not going to pick a winner between the two numbers. Both figures come from Craftsman’s own page. What we can say is that the page does not reconcile them, which makes the 60-minute figure the safer one to plan around.
The CMCB204 battery itself
The Craftsman V20 4.0 Ah Lithium Ion Battery, model CMCB204, is described by Craftsman as offering “up to 3x the capacity versus the standard of a standard 20V MAX lithium battery.” Notice what that claim does not do: it does not name the battery it is comparing against, so do not assume it means every other Craftsman V20 pack is exactly one-third of this capacity. It is a marketing framing, not a universal multiplier.
Beyond capacity talk, the CMCB204 has a “3-LED state of charge for immediate battery charge feedback,” “No memory and virtually no self-discharge means this battery is ready when you are,” and a “3 Year Limited Warranty.” Craftsman also states it is “Compatible with the entire CRAFTSMAN V20 tool lineup.”
What the CMCB104 charger does
The CMCB104 is a single-bay V20 charger with an “LED charging indicator for battery charge rate feedback” and “Overload protection [that] protects battery cells for longevity.” Craftsman says it is “Compatible with CRAFTSMAN V20 power tool and outdoor tool batteries,” so it is not limited to indoor power tools.
That said, the charger page’s charge-time messaging is genuinely confusing. The marketing sections point to 60 minutes or less for compact and 2.0 Ah packs, while the spec table lists “Charge Time: 30.0-min” without saying for which battery. Whether the 30-minute figure is an ideal condition, a different battery, or an older listing that never got updated is anyone’s guess. Craftsman does not clarify.
Practical takeaway
For the CMCB104, plan on about 60 minutes for a full charge of a compact V20 battery, because that is the number Craftsman repeats. If you want a precise time for your own CMCB204 4.0 Ah pack, the most reliable method is the low-tech one: plug it in once and time it. For the CMCB204’s “3x capacity” claim, treat it as a rough comparison to an unnamed baseline rather than a hard rule about every other Craftsman battery.
If you are also trying to sort out the bigger V20 picture, such as which tools use the platform, the 100-plus product compatibility claim, or the 2018 “Craftsman 20V”/DieHard naming confusion, this site’s separate Craftsman V20 platform guide covers that ground in full.
How this was checked
Facts on this page are drawn from Craftsman’s own V20 4.0 Ah Lithium Ion Battery (CMCB204) and V20 Lithium Ion Battery Charger With LED Charging Indicator (CMCB104) product pages.
Sources checked: 2026-08-11. A new review date will only be set after the linked pages are re-checked.