Fromm P318 18V Cordless Drill Replacement Battery 4000mAh
This product ships directly from our Manufacturer’s Warehouse and is usually delivered within 5 – 8 business days to your doorstep.
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Fromm P318 18V Cordless Drill Replacement Battery 4000mAh - 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.
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.
Fromm P318 18V Cordless Drill Replacement Battery 4000mAh - is backordered and will ship as soon as it is back in stock.
Voltage
18V
Amp
4000mAh
Fromm P318 / P326 / P327 / P328 Series — 18V Li-ion Replacement Battery
This 18V 4000mAh (72Wh) Li-ion battery replaces the original pack on Fromm P318, P326, P327, and P328 cordless tools. It matches the voltage rail and connector format of the original, so the tool recognises the pack and the charger accepts it without modification. Capacity figures come directly from the product specification — 4000mAh at 18V nominal.
- P318 / P326 / P327 / P328 platform fit: These four Fromm models share the same 18V battery interface, connector pinout, and BMS handshake protocol. One battery covers the full range — no adapter or firmware change needed.
- Bench tested on actual hardware: We cycled this pack through repeated motor-start inrush events on a drill platform. The BMS held the overcurrent threshold steady across cold and warm starts without tripping into protection mode under normal trigger use.
- Break-in load protocol: On first use, run the tool at half load for two cycles before applying full torque. This lets the BMS measure the motor's inrush current draw and calibrate its overcurrent protection thresholds before you hit maximum demand.
BMS cutoff on motor-start inrush surge during trigger pull
Cordless drills pull their highest current in the first milliseconds after trigger press — this is motor-start inrush, and it can be three to five times the steady running current. A new pack coming out of storage has resting cells with no inrush profile stored in the BMS. If the BMS overcurrent threshold is set conservatively at factory defaults, a hard trigger pull into a stalled or high-resistance fastener can trip the protection circuit. The fix is to run two half-load break-in cycles so the BMS can log real inrush data before you apply full torque.
Tool bogs under load and loses torque mid-fastener
If the drill starts normally but loses power or slows when driving into dense material, the cause is usually voltage sag — the cell voltage drops under sustained current draw faster than the BMS can compensate. This is often worsened by dirty or corroded contact rails on the battery slot, which add resistance to the power path. Clean the battery terminals and tool contacts with isopropyl alcohol, then retest. If sag continues, check resting voltage with a multimeter — a healthy 18V Li-ion pack should read between 19.8V and 20.5V fully charged.
Compatible Models
Technical Specifications
Product Highlights
- Brand: Fromm
- 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 Fromm drill cuts out instantly the moment I pull the trigger hard — what's tripping it?
That's the BMS hitting its overcurrent threshold on motor-start inrush. The spike at trigger press can reach three to five times the steady running current, and a new or recently stored pack hasn't yet profiled that draw. Run two light-load cycles first — half-speed, low-resistance material — before applying full torque. After two cycles the BMS sets a calibrated threshold and hard starts stop tripping the cutoff.
The charger won't recognise this battery at all — no lights, no charge cycle starts.
If the pack has been in storage, cell voltage can drop below the charger's acceptance threshold — typically under 12V on an 18V Li-ion pack. Most chargers won't initiate a charge cycle on a pack that reads below that floor. Some Fromm-compatible chargers have a recovery or "boost" mode — hold the battery in the dock for 30 seconds, remove it, and reinsert to prompt a re-check. If the charger still won't respond, measure pack voltage at the terminals; anything above 10V is recoverable with a charger that supports trickle pre-charge.
The tool runs fine indoors but feels noticeably underpowered on cold morning job sites — is the battery damaged?
No, this is Li-ion internal resistance behaviour. Below 5°C, cell resistance rises sharply, which reduces the current the pack can deliver and causes visible torque loss under load. The cells aren't damaged — warm the battery to above 10°C before use, either by keeping it inside until you need it or running a light no-load spin for 30 seconds to generate internal heat. Once cell temperature rises, output returns to normal and the effect is not permanent.
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