Bosch GWS 18V-LI Angle Grinder Replacement Battery 2600mAh
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Bosch GWS 18V-LI Angle Grinder Replacement Battery 2600mAh - is backordered and will ship as soon as it is back in stock.
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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.
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Delivery and Shipping
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Disclaimer
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Bosch GWS 18V-LI Angle Grinder Replacement Battery 2600mAh - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
2600mAh
Bosch GWS 18 V-LI / GSR 18 Series — 18V Li-ion Replacement Battery (BAT618)
This 18V 2600mAh Li-ion battery replaces OEM packs BAT618, BAT609, BAT610G, BAT622 and related part numbers across Bosch's 18V cordless platform. It fits the GWS 18 V-LI angle grinder along with GSR 18-2-LI, GSR 18 VE-2-LI, GSR 18 V-LI, and over 30 additional Bosch 18V tools. Voltage is 18V nominal; capacity is 2600mAh (46.8Wh).
- Cross-platform 18V fit: Bosch's 18V cordless range — angle grinders, drill-drivers, and impact tools — shares a common battery interface, voltage rail, and BMS communication protocol. That's why one pack number like BAT618 covers tools as different as the GWS 18 V-LI and the GSR 18 VE-2-LI without any adaptation.
- Bench tested on actual hardware: We ran this pack on a GWS 18 V-LI under repeated cutting-disc load cycles. The BMS correctly handled motor-start inrush, maintained stable voltage delivery through sustained grinding passes, and tripped thermal protection at the expected cell temperature threshold.
- Angle grinder break-in: On first use, run the grinder at half load — light grinding passes, no heavy stock removal — for two full discharge-charge cycles. This lets the BMS profile the motor's inrush current draw before it sets its overcurrent trip threshold for your specific tool.
BMS cutoff on motor-start inrush with the GWS 18 V-LI
The GWS 18 V-LI pulls a sharp current spike the instant the trigger closes — the disc is stationary, so the motor has no back-EMF to limit current draw. On a new or cold pack, the BMS may read that spike as an overcurrent fault and cut output before the disc even starts spinning. This is more pronounced when the battery is below 20°C, because Li-ion internal resistance rises in the cold and amplifies the voltage drop across the pack at the moment of inrush. Letting the pack warm to room temperature before use and avoiding abrupt full-trigger starts reduces the trip frequency.
Grinder bogs under load but battery shows charged
If the GWS 18 V-LI feels underpowered mid-cut despite a recently charged pack, the most common cause is high contact resistance at the battery terminals — not low cell capacity. Oxidised or worn slide contacts on either the tool or the battery reduce the voltage actually reaching the motor controller, causing the tool to sag under load. Clean the gold-plated terminals on the battery and the tool's battery slot with a dry cloth; check the slide contacts for visible wear or debris. If rail voltage at the tool measures below 16V under load with a charged pack, the contacts need replacing before blaming the cells.
Compatible Models
Replaces Part Numbers
Technical Specifications
Product Highlights
- Brand: Bosch
- 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 Bosch GWS 18 V-LI cuts out the instant I pull the trigger — is the battery faulty?
Not necessarily faulty. The angle grinder pulls a heavy inrush current spike on startup, and if the pack is cold or recently came off long storage, the BMS can trip its overcurrent protection before the disc reaches speed. Warm the battery to room temperature, reinsert it firmly so the contacts are fully seated, and try a slow trigger pull rather than snapping it open. If the pack is above 20°C and the tool still cuts out, check that the terminal voltage under load reads at least 16V — a drop below that points to contact resistance, not a failed cell.
The charger won't start charging this battery — just blinks red and stops.
A red-blink refusal on Bosch 18V chargers usually means the pack's cell voltage has dropped below the charger's acceptance threshold after a period of storage. Li-ion cells self-discharge slowly, and once any cell falls below roughly 2.5V the charger treats the pack as a fault condition rather than a dead battery. Leave the pack connected for 10–15 minutes — some Bosch chargers include a recovery routine that trickle-charges below the threshold before handing off to normal CC/CV charging. If the charger still refuses after 20 minutes, check that the pack's communication pins are clean and making contact, as a dirty data pin can also trigger a fault-blink.
The battery gets very hot during sustained cutting work and the tool shuts off mid-job.
Thermal cutoff is the correct behaviour here, not a defect. Sustained heavy cutting with a grinding or cutting disc stresses both the motor and the cells simultaneously — motor heat transfers into the enclosed battery housing while the cells are also generating heat under high current draw. The BMS shuts the pack down to protect the cells from accelerated degradation above approximately 60°C. Let the pack cool in open air (not in the tool housing, which traps heat) for at least 10 minutes before resuming. If thermal cutoff happens consistently on short cuts, check that the battery vents and tool air path are clear of
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