HiKOKI BSL36B18 18V Replacement Battery 5000mAh Li-ion
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
WECARE5
Check that your old battery model number and device model to match our description. This makes sure they work together.
We ship your order same day if you buy it before 4 PM EST.
HiKOKI BSL36B18 18V Replacement Battery 5000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Let customers speak for us
Send Your Battery Photo
Expert Technician Help
Snap a photo or video of your battery and send it to us. We'll identify the exact replacement—fast and hassle-free. Our team has helped thousands of customers find the right battery quickly and easily.
POST YOUR BATTERY IMAGE
Product & Solutions Expert
✉ sales@batteryweb.com
Battery Care Tips
Battery Care Tips
🔹 Getting Started
Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.
🔹 Keep It Healthy
Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.
Delivery and Shipping
Delivery and Shipping
🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.
Disclaimer
Disclaimer
⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.
🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
HiKOKI BSL36B18 18V Replacement Battery 5000mAh Li-ion - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
5000mAh
HiKOKI UB18DJL Series — 18V Li-ion Replacement Battery (BSL36B18)
This 18V Li-ion battery replaces the BSL36B18 and BSL36A18 packs across the HiKOKI 18V platform. It fits the UB18DJL, UB18DJL(L0Z), WF18DSL, WF18DSL(H4Z), and over 75 additional 18V HiKOKI tools. Capacity is 5000mAh (90Wh).
- 18V HiKOKI platform fit: The UB18DJL, WF18DSL, and related models share the same 18V rail voltage, physical slide-in connector, and BMS communication protocol. That shared architecture is why one pack spans the full 18V lineup — the cells, contact pins, and handshake logic are identical across these tools.
- Bench tested on actual hardware: We ran this pack on a UB18DJL under repeated trigger-pull cycles. The BMS handled motor-start inrush current without tripping, held rail voltage within spec through full torque cycles, and returned accurate charge-state data to the charger on each reconnect.
- Break-in on first use: On first use, run the drill at half load for two cycles before full torque applications. This lets the BMS profile the motor's inrush current draw and set accurate overcurrent protection thresholds before you push the pack hard.
BMS cutoff on motor-start inrush surge
When you pull the trigger on a drill or impact driver, the motor draws a brief current spike — sometimes 3–5× the running current — before it reaches operating speed. If the BMS overcurrent threshold is set conservatively or the cells are cold, that spike can trip the protection circuit and cut the pack off instantly. This is not a faulty battery; it's the BMS doing exactly what it's there to do. Let the pack warm to room temperature, re-seat it firmly in the tool, and try a slow trigger pull first to ramp the current draw gradually.
Charger not recognising a pack that's been in storage
Li-ion cells self-discharge during storage. If the pack sits long enough, cell voltage drops below the threshold most chargers use to accept a new charge cycle — typically around 2.5V per cell. The charger sees voltage too low to safely charge and either blinks red or does nothing at all. To recover the pack, leave it on the charger for 15–20 minutes; most HiKOKI chargers include a soft-start or wake-up mode that trickle-charges cells up to the acceptance voltage before switching to full charge. If the charger still won't engage after 30 minutes, check each cell group — any cell below 2.0V will hold the entire pack from charging.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: HiKOKI
- Manufacturer: CS
- Series: Standard
- Color: Black
- Product Type: Li-ion
- Battery Type: Li-ion
- Warranty: 12 Months
- Bulk Orders: sales@batteryweb.com
Frequently Asked Questions
My HiKOKI UB18DJL cuts out the instant I pull the trigger hard — is the battery dead?
Not dead — the BMS tripped on motor-start inrush current. That trigger-pull spike can hit 3–5× the tool's running current, and if the pack is cold or below roughly 30% charge, the BMS cuts the circuit before the motor reaches speed. Warm the pack to room temperature, re-seat it in the tool, and start with a slow trigger pull to ramp current gradually rather than hitting full load instantly.
The drill bogs down and feels weak under sustained pressure even with a charged battery — what's causing that?
That's voltage sag — the rail voltage drops under sustained high-current draw, and the tool loses torque as a result. The most common cause is high contact resistance at the battery terminals: clean the slide-in contacts on both the pack and the tool with a dry cloth or contact eraser. If sag persists after cleaning, check that the pack is fully charged and above 18V at rest before loading the tool.
The battery works fine in summer but noticeably loses power on cold job sites — is something wrong?
Nothing is wrong. Li-ion internal resistance rises significantly below 5°C, which reduces the current the cells can deliver and causes the BMS to pull back output to protect the pack. Store the battery inside overnight rather than leaving it in a vehicle or tool bag in freezing temperatures. A pack brought to room temperature before use will deliver full rated output; a pack starting at 0°C may feel like it has lost 20–30% of its capacity until it warms up under load.
Payment & Security
Payment methods
Your payment information is processed securely. We do not store credit card details nor have access to your credit card information.
