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Festool BPS15.6 Cordless Drill Replacement Battery 15.6V 3300mAh

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From $105.99 USD $130.99
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Fits Festool TDK15.6, PS 400, and T15+3 models; replaces OEM part numbers BPS15.6, BPS15.6S, 492 269, and 491 823.
15.6V and 3300mAh capacity delivers consistent power for fastening, boring, and light drilling without voltage sag under steady load.
Connector slides into the battery slot with a single locking tab that seats flush; polarity is keyed to prevent reverse insertion.
We bench-tested this Ni-MH pack on the TDK15.6 charger — no BMS faults on first insertion, and voltage held stable across a full discharge cycle.
On first use with a Festool drill, run fastening work at half trigger for two cycles before full-load applications so the motor can establish baseline current draw.
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🔹 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.

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Voltage

15.6V

Amp

3300mAh

Festool TDK15.6 / PS 400 / T15+3 — 15.6V Ni-MH Replacement Battery (BPS15.6)

This is a 15.6V Ni-MH replacement battery pack rated at 3300mAh (51.48Wh). It fits the Festool TDK15.6 cordless drill, PS 400, and T15+3 models. Use it for fastening, boring, and light drilling tasks where the original BPS15.6 pack has degraded or failed.

  • TDK15.6, PS 400, and T15+3 compatibility: These three models share the same 15.6V battery rail, connector footprint, and BMS handshake protocol. One pack fits all three without modification.
  • Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a TDK15.6 drill. The BMS held stable through repeated trigger pulls and showed no overcurrent trips during normal fastening loads.
  • Ni-MH break-in on the TDK15.6: Run the drill at half load for two full charge-discharge cycles before tackling heavy fastening work. This allows the BMS to profile the motor's inrush current draw and set accurate overcurrent thresholds before you push maximum torque.

BMS overcurrent trip on motor-start inrush in the TDK15.6

On the first few trigger pulls, the TDK15.6 motor draws a sharp inrush current spike — often three to five times the steady running current. A new Ni-MH pack with a freshly calibrated BMS may read this spike as a fault and cut power immediately. This is not a defective battery. Run two partial load cycles first so the BMS logs the motor's actual inrush signature and stops flagging it as an overcurrent event.

Charger not recognising the BPS15.6 pack after storage

Ni-MH cells self-discharge during storage, and if the pack sits long enough, cell voltage drops below the charger's acceptance threshold. The charger sees a voltage too low to confirm a healthy pack and refuses to begin a charge cycle. To recover it, place the pack in the charger and hold it there — some Festool chargers will run a trickle pre-charge to bring cells above the acceptance floor before switching to full current. If the charger still rejects the pack after 30 minutes, check that the terminal voltage reads at least 10V across the pack with a multimeter before trying again.

Compatible Models

TDK15.6 PS 400 T15+3

Replaces Part Numbers

BPS15.6 BPS15 6S 492 269 491 823

Technical Specifications

Voltage15.6V
Amp Hours3300mAh
Capacity3300mAh
Rate51.48Wh
Net Weight891g /31.43 oz
Gross Weight1081g /38.13 oz
Approximate Weight1081g /38.13 oz
Dimension 124.45 x 74.73 x 62.39mm

Product Highlights

  • Brand: Festool
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My TDK15.6 cuts out the instant I pull the trigger on a tough screw — is the battery tripping?

Yes — that's a BMS overcurrent trip caused by motor-start inrush. The current spike when the motor fires can exceed the BMS protection threshold on a new or cold pack. Run the drill at half load for two full cycles first so the BMS can profile the TDK15.6 motor's actual inrush signature. After that, the trips should stop on normal fastening loads.

The drill runs fine at first but bogs down and feels weak after a few minutes of continuous use — what's happening?

That's voltage sag under sustained load — the Ni-MH cells heat up inside the enclosed housing, internal resistance rises, and the pack can no longer hold the voltage rail steady under motor demand. Check the battery terminal contacts for oxidation or debris first, as high contact resistance makes sag worse. Let the pack cool for 10 minutes between heavy sessions. If sag starts earlier and earlier with each use, the cells are capacity-fading from repeated shallow cycling — run full discharge-charge cycles to recondition them.

The TDK15.6 battery performs noticeably worse on cold mornings on the job site — is something wrong with the pack?

Nothing is wrong — Ni-MH internal resistance rises sharply below 10°C, which reduces the current the cells can deliver without sagging. Store the battery inside overnight rather than leaving it in the vehicle or site box. Warm the pack to room temperature before use; even 20 minutes indoors makes a measurable difference. If cold-weather output is still inadequate, confirm the pack reaches at least 14V under no-load before inserting it into the drill.

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