A rapid charger can keep your cordless tools ready, but the right choice depends on your battery platform and how many packs you need to charge. A charger that fits a 21V battery with a compatible connector will not necessarily work with another 21V pack, and brand-specific systems such as Milwaukee M12/M18 and Ryobi ONE+ need the right charger for their batteries. Below, we compare five options by compatibility, charging setup, and the features that matter in everyday use.
Table of Contents
Quick Comparison
| Charger | Battery compatibility | Charging setup | Standout feature |
|---|---|---|---|
| SUNBANANA 21V Single-Port Rapid Charger | Some 21V lithium-ion batteries with standard Makita or Dayi connectors | One battery | Lists charge times for 2,000mAh and 4,000mAh packs |
| Milwaukee M12/M18 Rapid Charger | Milwaukee M12 and M18 batteries | Sequential charging | Charges both battery platforms |
| Milwaukee M18 PACKOUT Six-Bay Rapid Charger | All Milwaukee M18 batteries | Six bays; charges two at a time, then proceeds in pairs | USB-A charging port and side storage caddies |
| UORLEN 21V Tool Battery Charger | Listed 20V/21V lithium batteries with a compatible DC connector | One battery | Long power cord and multiple listed protections |
| Abeden Dual-Port Ryobi Replacement Charger | Listed Ryobi ONE+ 18V batteries and some 12V/14.4V NiCad or NiMH packs | Two ports | USB port and battery-status lights |
Our Picks: Best Rapid Chargers For Cordless Tool Batteries reviews
1. SUNBANANA 21V Charger: A Simple Option for Compatible Packs
The SUNBANANA is a single-port charger for certain 21V lithium-ion batteries. Its listing says it fits packs with standard Makita and Dayi connectors, but that does not mean it works with every battery sold under those brands. Check the connector and battery details before buying.
The listed charge times are specific: a 2,000mAh battery takes about 45 minutes, while a 4,000mAh battery takes about 90 minutes. Those figures give you a useful estimate for compatible packs, though actual charging can depend on the battery. The charger accepts 100–240V AC input and has an LED indicator to show charging status.
It also lists protections for overload, overheating, overcharging, overcurrent, overvoltage, and over-discharge. Compared with the other options here, this is a straightforward pick if you need one charger for a compatible 21V pack. It is not the right choice if you need multiple bays or a confirmed fit for a battery outside the listed connector types.
Pros:
- Lists charge times for two battery capacities
- Universal 100–240V AC input
- LED charging-status indicator
- Several listed electrical and temperature protections
Cons:
- Compatibility depends on the battery connector; “21V” alone is not enough to confirm fit
- Single charging port
Verdict: Choose the SUNBANANA if your 21V battery has a confirmed compatible connector and you want a simple single-pack charger with stated charging estimates.
2. Milwaukee M12/M18 Rapid Charger: One Charger for Two Battery Platforms
This Milwaukee charger is designed for both M12 and M18 lithium-ion battery packs, which can make it useful if your tool collection spans the two platforms. Rather than charging both inserted batteries at once, it works sequentially: it charges the first pack and then moves on to the second.
The listing says it can charge packs up to 40% faster than standard chargers and indicates when a battery reaches an 80% charge. That faster-charge figure is a stated comparison, not a universal time estimate for every pack. The listing also notes that the item may arrive in non-retail packaging or packaging that has been opened for inspection.
Its main advantage over the single-platform chargers below is flexibility across Milwaukee’s two battery systems. The trade-off is that it is not a multi-bay solution for a large M18-only fleet, and sequential charging means the second battery waits its turn. Confirm that you are comfortable with the listed packaging conditions before ordering.
Pros:
- Accepts Milwaukee M12 and M18 batteries
- Sequential charging can move to a second pack automatically
- Indicates when a battery reaches 80% charge
- Listing claims charging up to 40% faster than standard chargers
Cons:
- Charges batteries sequentially, not simultaneously
- May arrive in opened or non-retail packaging
Verdict: This is a practical fit if you use both Milwaukee M12 and M18 packs and value one charger for the two platforms over simultaneous charging.
3. Milwaukee M18 PACKOUT Six-Bay Charger: For a Larger Battery Rotation
This six-bay charger is built for Milwaukee M18 batteries. It can charge two batteries simultaneously, then automatically moves to the next pair when the first two are charged. That setup suits a busy work area with several packs to cycle through, but it does not charge all six at once.
The listing says the charger works up to 40% faster than standard chargers and includes a USB-A port rated at 5V/2.1A for personal electronics such as phones or headlamps. Storage caddies on both sides provide space for devices while charging. These extras make it more of a charging station than a basic single-pack unit.
Compared with the M12/M18 charger, this model offers more M18 bays but does not list M12 compatibility. It is also a larger-capacity choice than most people need if they own only one or two batteries. Check your battery platform and charging needs before choosing it for a smaller setup.
Pros:
- Six bays for an M18 battery rotation
- Charges two batteries simultaneously and proceeds in pairs
- USB-A port for compatible personal electronics
- Side caddies provide storage space while charging
Cons:
- Designed for M18 batteries, not listed as an M12 charger
- Only two batteries charge at a time
Verdict: Pick this Milwaukee model if you use several M18 packs and want a multi-bay station; for a small battery collection, a simpler charger may be more suitable.
4. UORLEN 21V Charger: A Long-Cord Option for Compatible Tools
The UORLEN charger is listed for 20V and 21V lithium batteries used with a range of cordless tools. The description names tools such as chainsaws, drills, trimmers, and impact wrenches, as well as a long list of brands. Because broad compatibility claims can be easy to misread, check your battery’s connector and requirements rather than relying on voltage or brand name alone.
Its listed specifications include 100–240V AC input, a DC output of 21V at 0.1–2A, a maximum power of 42W, and a 6.6-foot power cord. The product description also specifies a 5.5 × 2.5mm DC connector that is described as compatible with 5.5 × 2.1mm. Make sure that connector detail matches your battery before ordering.
The listing names several protections, including overcurrent, overcharge, overtemperature, undervoltage, overvoltage, overload, and surge protection. It does not provide specific charging times, so it is harder to compare its speed directly with the SUNBANANA or Milwaukee models. The single-port design is best for someone who needs a compatible replacement charger, not a multi-battery charging station.
Pros:
- 100–240V AC input
- 6.6-foot power cord
- Lists compatibility with a range of tools and battery brands
- Multiple listed electrical protections
Cons:
- Compatibility depends on the exact battery and connector
- No specific battery charge times are provided
Verdict: Consider the UORLEN if its connector and electrical specifications match your 20V/21V battery, but do not assume every battery at those voltages will fit.
5. Abeden Dual-Port Charger: A Ryobi Replacement with Extra Charging Features
The Abeden is a dual-port replacement charger listed for Ryobi ONE+ 18V batteries, including lithium-ion, NiCad, and NiMH packs. It also lists support for certain 12V and 14.4V NiCad or NiMH batteries, but specifically excludes 12V and 14.4V lithium-ion packs. Check the battery chemistry and model against the compatibility list before buying.
The charger is described as charging two batteries simultaneously. Its listed output is 2A for 18V lithium-ion packs and 1.5A for NiCad or NiMH packs; the description estimates two to three hours for a 6.0Ah 18V battery. It also includes a 5V/5A USB port and LED indicators for power, charging, full charge, and battery fault status.
Other listed features include a maintenance mode after charging, heat dissipation, and protections for overcharge, overcurrent, overload, short circuit, and overheating. The listing also describes a 12-month warranty and a 45-day money-back guarantee. Compared with the Milwaukee options, this is aimed at Ryobi batteries, so its extra ports are useful only if its compatibility matches your packs.
Pros:
- Two charging ports for simultaneous battery charging
- Supports listed Ryobi ONE+ 18V lithium-ion, NiCad, and NiMH packs
- USB port and clear charging-status indicators
- Lists a maintenance mode and several safety protections
Cons:
- Does not support 12V or 14.4V lithium-ion batteries, according to the listing
- Compatibility covers specific battery types and models, so checking the list is important
Verdict: The Abeden is worth considering if you own compatible Ryobi packs and want two charging ports plus a USB output, but verify battery chemistry and model first.
How to Choose a Rapid Charger for Cordless Tool Batteries
Match the charger to your battery platform
Start with the exact battery platform and model, not just the voltage printed on the pack. Milwaukee M12 and M18 batteries, Ryobi ONE+ batteries, and other 20V or 21V packs use different connections and charging systems. A charger listing that mentions your voltage or tool brand may still not confirm a fit for your specific battery.
Check the connector and battery chemistry
For replacement chargers with broad compatibility claims, compare the plug or battery interface with your pack. Also check the battery chemistry: a charger that supports lithium-ion may not support NiCad or NiMH, and support for one chemistry does not automatically mean support for another. Follow the battery and tool maker’s charging guidance if you are unsure.
Decide how many batteries you need to charge
A single-port charger can suit a small collection, while a dual-port model can help when you regularly rotate between two packs. A multi-bay charger can organize a larger battery fleet, but check whether it charges every battery at once or works in sequence. For example, a six-bay design that charges in pairs offers more slots than a single charger but does not charge all six simultaneously.
Compare charging claims carefully
Look for a charging time tied to a specific battery capacity, as well as the charger’s output information. A claim such as “faster” is less useful without a clear comparison or a stated time for your battery. Actual charge time can vary by battery capacity and condition, so treat listed estimates as guidance rather than a guarantee for every pack.
Consider indicators, ports, and storage
Status lights can help you see whether a battery is charging, full, or reporting a fault. Some chargers also offer a USB port or storage space for small devices. These features can be useful at a workbench or job site, but they should come after compatibility and charging setup in your decision.
Review safety information and package details
Check which protections the listing describes, such as overcharge, overcurrent, or overheating protection. Also pay attention to packaging notes: a product may be supplied in non-retail packaging or in packaging that has been opened for inspection. If anything about the charger, battery fit, or package condition is unclear, confirm the details before ordering.
Frequently Asked Questions
Can I use any 21V charger with a 21V tool battery?
No. Voltage alone does not confirm compatibility. The battery connection, charging requirements, and battery chemistry must also match the charger. Check the exact battery model and connector before buying.
Does a rapid charger charge every battery at the same speed?
No. Charge time can vary with battery capacity, battery condition, and charger output. Use any time estimate as a guide for the specific battery size listed, not as a promise for every pack.
Can the Milwaukee M12/M18 charger charge two batteries at once?
The supplied listing describes sequential charging. It charges one battery first and then automatically moves to the second, rather than charging both simultaneously.
Does the Milwaukee six-bay charger charge all six batteries at once?
No. Its listing says it charges two batteries simultaneously and then proceeds to the next pair. It is designed to manage several M18 batteries, but all six do not charge at the same time.
Can the Abeden charger charge Ryobi 12V lithium-ion batteries?
The supplied description specifically says it does not support 12V or 14.4V lithium-ion batteries. It lists certain 12V and 14.4V NiCad or NiMH packs instead, so check the chemistry and model carefully.
What should I check before using a replacement charger?
Confirm the battery model, voltage, chemistry, connector, and charger output. If the listing does not clearly confirm a match, check the battery or tool maker’s guidance before charging.
Final Recommendation
For a compatible 21V battery and a simple single-port setup, the SUNBANANA stands out for listing charge-time estimates. Milwaukee users with both M12 and M18 packs may prefer the cross-platform charger, while the six-bay PACKOUT model is better suited to a larger M18 battery rotation. Ryobi owners who need two ports can consider the Abeden, provided their battery type is on its compatibility list. Whichever model you choose, verify the exact battery fit before plugging it in.
