Smart Battery Charger KDR-B12
Ranked #1 on Amazon
（*As of December 2025）- Regular price
-
¥3,988 - Regular price
-
- Sale price
-
¥3,988
Tax included.
Shipping calculated at checkout.
[Smart Battery Charger] USB Input Compatible Battery Charger This USB-input type battery charger allows you to easily charge your battery even in environments without access to an AC outlet. It supports 12V DC lead-acid and lithium-ion batteries, making it suitable for a wide range of applications. Charge via USB Power Instead of traditional 100V AC power, this charger is designed to be powered by USB. Because it can be powered by a portable power station or mobile power bank, you can charge your battery even if your parking space lacks an electrical outlet.
※
Not compatible with EFB batteries (idling stop systems), lithium batteries for non-motorcycle/car use, or gel batteries (non-liquid batteries).
※Caution: Some mobile power banks feature power-saving functions that automatically turn off the power once charging is complete, which may prevent the maintenance charging feature from being used. In such cases, using a loop circuit (if the power bank has two USB ports, routing one back into the power bank's input) may help maintain continuous operation. This function keeps the power on as long as the mobile power bank is in a charging or USB output state. Please consult the manufacturer of your mobile power bank regarding the presence of this feature.
[Ease and Convenience for Any Environment] High-Efficiency Automatic Optimized Charging With an output of up to 2A (※limited by input power), the charger automatically optimizes the battery until it is fully charged, preventing degradation while ensuring efficient charging. Maintenance Charging Function Equipped with a maintenance mode that automatically resumes charging if a voltage drop is detected after the initial charge is complete.Keep the charger connected after a full charge to perform maintenance charging. (Maintenance charging cannot be used with power sources that have automatic power-off functions when in standby, such as some mobile power banks.) Please disconnect the charger from the vehicle when not performing charging or maintenance charging.
Easy Connection via SAE Connector You can start charging simply by leaving the wiring connected to the vehicle and plugging in the SAE connector. Alternatively, use the included alligator clips for direct connection to the battery. Convenient and Versatile Usage Scenarios Supporting USB input allows you to charge from portable power stations or mobile power banks. It is useful in parking lots, outdoors, or any environment without an AC outlet. This USB-input battery charger is the perfect product for those seeking ease and convenience in battery charging. Please make use of it for your vehicles and portable power applications.
[Product Details] ■The output power of this product varies depending on the input power. We recommend using a USB cable that supports USB output. USB Type-A: Max 18W Input voltage 5V 2.4A, output current/13.0V 0.6A; Input voltage 9V 2A, output current/13.0V 1A; Input voltage 12V 1.5A, output current/13.0V 1.25A USB Type-C: Max 30W Input voltage 15V 2.5A, output current/13.0V 2A; Input voltage 20V 1.5A, output current/13.0V 2A ※Please refer to the specification table in the catalog for details. ■Before starting the charge, the smart chip checks the battery's voltage and condition. It determines the state of deep discharge or degradation and sets an appropriate charging plan. ■In the initial stage of charging, the device uses a constant current mode for efficient charging, and as the battery voltage rises, it switches to constant voltage mode. This allows for efficient charging while reducing the load on the battery. ■As the battery approaches a full charge, the smart chip automatically reduces the charging current. Once fully charged, it stops charging to prevent battery degradation due to overcharging. It monitors the battery temperature during charging and adjusts the charging current or temporarily stops charging if overheating is detected. This improves safety and extends the life of the battery. ■If the battery has not been used for a long time or is kept connected, the smart chip performs appropriate maintenance charging to maintain battery health. ■Please note that if the battery is diagnosed as unchargeable due to degradation, it may not be possible to charge it.
[Product Specifications] ■Indicator Lamp Blue steady: Connected, Green flashing: Charging, Green steady: Fully charged, Red steady: Error ■Input voltage: 5–20V (Type-C connector) ■Output voltage: 3–14.4V ■Output current: Max 2A ■Protection circuit: Reverse connection/overvoltage/overcurrent/short circuit ■Set contents: Main unit, SAE harness/1200mm, SAE harness (alligator clips)/600mm ■Instruction Manual (Online Only): As part of our decarbonization efforts to reduce environmental impact, we have discontinued including paper manuals. You can view or download it from each product page on the official Kaedear website.
[Usage Precautions]
■Because this product features a maintenance charging function, it continues to consume a small amount of power even after the vehicle battery is fully charged to maintain its condition.
General mobile power banks are equipped with over-discharge protection to prevent voltage drops below a certain level to protect their lithium-ion batteries.
However, some mobile power banks are designed to depend on the charging control of the connected device (like a smartphone), and may lack an over-discharge protection function on the power bank itself, or the protection may be insufficient.
If such a mobile power bank is connected to this product, the continuous power consumption by the maintenance charging feature may lead to an over-discharged state in the mobile power bank, potentially making it unable to be recovered or used further.
When using this product with a mobile power bank, please confirm that your power bank is equipped with an over-discharge protection function before use.
Since mobile power banks are not our products, we cannot provide guidance on compatibility or guarantee their operation.
Please check with the seller or manufacturer regarding the presence and specifications of protection functions.
[Manufacturer's Warranty and After-Sales Service] Manufacturer's warranty period: 1 year (expiring on the same day as the purchase date). At Kaedear, we provide support after purchase to ensure customer satisfaction. For any questions about the product or consultations regarding installation on your motorcycle, we have staff members holding national maintenance certifications who can provide precise and expert technical support. In the unlikely event that a defect is diagnosed as being caused by a product failure, we will deliberate based on our manufacturer's warranty policy and provide free repair or replacement under the warranty. For commercial use, the manufacturer's warranty period will be halved. (e.g., if the manufacturer's warranty period is 1 year, it becomes 6 months, expiring on the same day 6 months from the month of purchase.) Please refer to the manufacturer's warranty policy on our official website for details. We provide support even after installation and use. As a Japanese manufacturer, we will respond with a spirit of hospitality. Please feel free to consult us first.
■About shipping
Shipping fee <br/>Normal products: Free shipping nationwide (within Japan only)
Aftermarket parts: 200 yen nationwide (free shipping for orders over 1000 yen)
Products from other manufacturers: 500 yen nationwide (free shipping for orders over 5,000 yen)
Product delivery time <br/>We will ship your product immediately after confirming your order.
Normally, it takes about 2 business days for the product to be shipped. If the shipment is delayed due to bad weather, the convenience of the delivery company, or for any other reason, we will notify you by email.
We do not ship on Saturdays, Sundays, or holidays.
Product delivery method <br/>After shipping arrangements are made by our company or Rakuten Logistics, to which we have outsourced part of the shipping operations, the product will be delivered by Japan Post or other shipping companies.
Handling of items exceeded the storage period <br/>Items returned after the storage period has expired will be stored for one month until we receive contact from the customer.
We will refrain from contacting you.
As soon as we receive your contact, we will charge you the reshipment fee (one-way shipping fee) and reship the item.
■About manufacturer's warranty
All our products are subject to the following:
The product is being used and installed correctly in accordance with its intended purpose.
Please improve the installation and handling methods according to the instructions given by our after-sales service staff.
The vehicle is being used in a manner prescribed by the Road Traffic Act.
We cannot guarantee the product if it is not installed or handled correctly. Please note that we are only responsible if the product is found to be defective, and we are not responsible for any damage other than the product. In the unlikely event that a defect in our product causes an accident or damages the user's property or body, and compensation for damages to the customer is legally recognized, we will handle it under the product liability insurance that we have subscribed to.
What is a product defect?
A product defect is a malfunction which can be restored to the original specifications of the product by repair or replacement. However, cases where the product specifications (specs, functions) do not meet the user's requirements are not considered product defects.
What is an initial defect?
If a malfunction occurs due to defects caused by individual differences in materials or manufacturing during normal use within 6 months of purchase, and the symptoms can be clearly confirmed in advance with images or videos, it may be considered a manufacturing defect, and we will first mail a replacement product free of charge. After receiving the product, you will use the return envelope enclosed and return it to us for inspection. If the product is not found to be defective upon inspection, we will replace it for a fee. Even if it is within 6 months, depending on the product and the state of damage, it may not be considered a manufacturing defect. We will handle it as a manufacturer's warranty, not as a manufacturing defect.
What is a manufacturer's warranty?
If a breakdown or other problem occurs during normal use due to defects caused by individual differences in materials or manufacturing, etc., we will repair or replace the product free of charge within the warranty period set for each product (including shipping costs for repair or replacement). The purpose is to protect customers from damage caused by damage to products that would not normally be damaged due to individual differences in the product. In addition, the purpose is to understand the product-specific defects and characteristics that are discovered through actual use, and use this information to improve the quality of products that we plan in the future.
Warranty period
The warranty period is from the date of purchase to the date stated in the product information. If the warranty period has expired, repairs or replacements will be available for a fee. For products that cannot be repaired or replaced, please purchase a new product.
Proof of warranty period
Proof of purchase date is required for each product warranty.
- For online purchases, please enter the product order number (personal sales on Yahoo! Auctions, Mercari, etc. are not eligible)
- For purchases made in store, please provide a receipt or invoice
The above proof of purchase is required for product warranty. If you cannot prove the purchase date, the product will not be covered by the warranty. Thank you for your understanding.
Regarding defect inspection
The cost of returning the product for inspection will be refunded if it is covered by the product warranty. If there is no problem with the product, you will be charged for the round-trip shipping fee. Please be aware of this in advance. We strive to narrow down the cause of the defect as much as possible before returning the product so that the shipping fee is not borne by the customer. After-sales service staff cannot visually grasp the actual situation, and the problem assumed by the after-sales service staff may differ from the actual problem based on verbal or written explanations alone. Please be sure to attach photos and videos, and perform troubleshooting as much as possible before the after-sales service staff provides guidance. In principle, the product will be judged after it is received and inspected. Please note that we cannot judge the product defect based only on email or official LINE.
Return Method
Japan Post / Yamato Transport / Sagawa Express (Please use the smallest possible packaging.)
If your after-sales service representative gives you instructions on how to return the product, please use the specified method to return it.
<Information to be filled in> Please be sure to fill in the following information before returning it.
・Order number: Please write your order number or enclose a receipt or invoice. ・Return details: Product warranty (defect details)
・Inquiries: Contact method when making inquiries ・Shipping address: Postal code, address, name, phone number
*If you do not fill in this information, your item will be returned as unknown.
<Return address>
〒226-0025
Advance 5-1F-B, 849-6 Tokaichiba-cho, Midori-ku, Yokohama, Kanagawa Prefecture
Kaedear Inc.
080-6583-4783
Regarding cash on delivery
If you return the item cash on delivery, we will refuse to accept the item unless you make a reservation for cash on delivery. We will only accept the item if you have made a reservation in advance.
<Common examples of electrical equipment>
When you report a malfunction in an electrical device, we will send it back for inspection, and there may be no problem with the product itself.
The power supply may be the cause, such as poor contact of crimps , high resistance due to terminal corrosion , loose fuse holders , short circuits due to wiring rubbing , and concentrated wiring due to the addition of electrical equipment . In the unlikely event that there is no problem with the product, we ask that you cover the round-trip shipping costs (including postage and return envelope fees). Thank you for your understanding and cooperation.
Regarding returns at your discretion
*If you decide to return the item, we will not be able to offer a refund or accept any other returns.
*If you are returning the item to the store as instructed by customer support, we will record the return request and then confirm the return/receipt.
*If we are unable to confirm your detailed information, we will respond in accordance with the storage period stipulated in the warranty regulations.
Warranty details
If a defect occurs within the warranty period, we will repair or replace it free of charge.
*Even if the product is replaced, the product warranty will be for the product model you purchased. Product changes such as model changes and color changes are not allowed under the product warranty. If the product cannot be repaired or replaced due to discontinuation of the product, we will provide a full refund.
Warranty Coverage
If the product is inspected and found to be defective.
Usage covered by the warranty
The correct installation, use, inspection and maintenance procedures provided by our staff are required. Please be sure to follow the instructions below. If you do not follow the instructions, we may refuse to provide warranty repairs. Thank you for your understanding.
1. You are using the Services in accordance with the contents of the product information on this OFFICIAL website, in catalogs, etc.
2. You are using the product in accordance with the instructions in the product manual.
3. You are using the service in accordance with the instructions of the after-sales service staff.
Items that cannot be guaranteed
The following items cannot be guaranteed:
- Defects caused by aging and wear during use. (The specifications are based on the product concept, and defects occur when used in other applications.)
- Minor sensory symptoms that do not affect the quality or functionality of the product (abnormal noise, vibration, operating speed, smoothness of operation).
- Product defects caused by natural disasters such as earthquakes, typhoons, floods, accidents, and fires.
- Product defects caused by soot, chemicals, bird droppings, salt damage, etc.
- Product defects caused by processing or modification of the product (excluding product defects not caused by processing or modification)
- Product defects that the user can discover and fix, such as loose bolts and nuts, as well as defects that are left unattended and cannot be fixed.
- Product defects caused by failure to follow the usage instructions covered by the warranty.
- Product defects that occur when the product is used under severe conditions that exceed normal usage, such as the usage environment, usage conditions, frequency of use, or number of uses.
- Damage caused by input force exceeding that expected under normal use.
- Problems with product characteristics. (Problems with product performance that cannot be improved by repair or replacement)
The following items cannot be covered:
- Costs for parts, repairs, maintenance, etc. other than the Product damaged due to the defect.
- Costs such as labor costs incurred when returning products for inspection.
(Including loss or damage that renders the product unusable while the product is being inspected) - Costs for loss, damage, etc., incurred when the vehicle cannot be used.
(Including communication costs, replacement costs, replacement vehicle costs, transportation costs, business damages, etc.)
There is a storage limit for your items.
If it is discovered that the cause of the defect is not the product itself, but the power supply, installation method, or handling method, we will charge you the round-trip shipping fee that we would normally cover. If you do not pay, we will store the product for one month, and if the period is exceeded, we will refund at least 10% of the purchase price and dispose of the product.
*If you are experiencing problems with a product malfunction or damage, even if the problem is not covered by the product warranty, please feel free to contact our after-sales service staff first.
