Bosch BAT618 18V Angle Grinder Replacement Battery 3000mAh
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Bosch BAT618 18V Angle Grinder Replacement Battery 3000mAh - 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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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Bosch BAT618 18V Angle Grinder Replacement Battery 3000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
3000mAh
Bosch GWS 18 V-LI Series — 18V Li-ion Replacement Battery (BAT618)
This 18V 3000mAh (54Wh) Li-ion battery replaces Bosch part numbers BAT618, BAT609, BAT610G, BAT622, and several 2 607 336 series packs. It fits the GWS 18 V-LI angle grinder along with the GSR 18-2-LI, GSR 18 VE-2-LI, GSR 18 V-LI, and over 30 additional 18V Bosch tools on the same platform.
- Bosch 18V platform compatibility: All listed models share the same 18V rail voltage, slide-in connector, and BMS communication protocol. The cell configuration and terminal layout are identical across the BAT609 through BAT622 family, which is why one pack covers this many tools without modification.
- Bench tested on actual hardware: We ran this pack on a GWS 18 V-LI under cyclic grinding load. The BMS held the discharge rail steady through repeated inrush spikes and triggered a clean overcurrent cutoff only at the correct threshold — no false trips during normal trigger pulls.
- Break-in procedure for angle grinder use: On first use, run the grinder at partial load for two full discharge-charge cycles before sustained cutting or grinding. This allows the BMS to calibrate its overcurrent threshold against the motor's actual inrush profile, reducing nuisance cutoffs during heavy disc work.
BMS cutoff on motor-start inrush surge in the GWS 18 V-LI
When you pull the trigger on an angle grinder, the motor draws a brief but sharp inrush current — often 3 to 5 times the steady running draw. A new or storage-conditioned pack can read this spike as an overcurrent fault and cut out immediately. The BMS needs two or three real-load cycles to distinguish a normal motor start from a genuine fault condition. If cutouts persist past the break-in cycles, check the slide-in terminal contacts for corrosion or debris raising contact resistance.
Grinder bogs and loses torque mid-cut without fully stopping
This is voltage sag — the cell rail drops under sustained disc load, and the tool slows instead of cutting out cleanly. It usually points to elevated internal resistance in the cells, which can happen after deep discharge or long storage. First, check that the battery slides fully into the tool and the terminals seat without play — a loose fit adds rail resistance and worsens sag. If seating is solid, charge the pack to full, run a complete discharge under moderate load, and recharge; if sag persists after two cycles, cell resistance has climbed past recovery and the pack needs replacement.
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 charger flashes red when I insert this battery after it sat in storage — what's wrong?
A battery that has self-discharged below roughly 2.5V per cell will fall under most Bosch charger acceptance thresholds, and the charger responds with a red fault blink rather than starting a charge cycle. Some chargers have a recovery or "boost" mode — consult the charger's manual for the recovery pin sequence. If your charger lacks that mode, a compatible charger with a wake-up function can bring the pack back up to acceptance voltage. Once the pack reads above 3V per cell, a standard charger will recognise it and begin the charge cycle normally.
The GWS 18 V-LI cuts out immediately every time I press the trigger — but works fine if I ease into it slowly. Is this the battery?
Yes — this is a BMS overcurrent trip triggered by motor-start inrush current. A full-trigger pull on a cold or freshly installed pack produces a current spike the BMS reads as a fault. Ease-starting works because the slower ramp-up keeps instantaneous current below the trip threshold. Run two full cycles with gradual trigger engagement to let the BMS profile the motor's inrush draw. After break-in, full-trigger starts should stop causing cutoffs.
The grinder runs fine for the first minute, then gets noticeably weaker and sluggish — what's causing that?
Sustained grinding load heats both the motor and the battery cells simultaneously. As cell temperature rises inside the enclosed pack housing, internal resistance increases and voltage sag worsens — the tool slows rather than cutting out cleanly. The BMS will eventually trigger a thermal cutoff if temperatures reach the protection threshold. Let the pack cool for 10–15 minutes, then check the terminal contacts are fully seated; if the sluggishness starts earlier each session, the cells are retaining heat from previous cycles and capacity is fading — check open-circuit voltage after a full charge; it should read 20.0–20.5V across the pack.
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