Festool TDD12 Replacement Battery 12V 3300mAh Ni-MH
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Festool TDD12 Replacement Battery 12V 3300mAh Ni-MH - 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
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Disclaimer
Disclaimer
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🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.
Festool TDD12 Replacement Battery 12V 3300mAh Ni-MH - is backordered and will ship as soon as it is back in stock.
Voltage
12V
Amp
3300mAh
Festool TDD12 Series — 12V Ni-MH Replacement Battery (BPH12T)
This is a 12V, 3300mAh Ni-MH replacement battery for the Festool TDD12, TDD12FX, TDD12ES, and TDD12MH cordless drill-drivers. It slots into the same battery bay as the original BPH12T and connects via the same multi-pin contact block. Voltage and capacity match the stock specification — 12V nominal, 39.6Wh total energy.
- TDD12 series compatibility: The TDD12, TDD12FX, TDD12ES, and TDD12MH all share the same 12V battery bay, contact layout, and charge termination logic. The BPH12T, BPH12, and TBP12 part numbers reference the same physical format across that production run — this battery covers all four variants.
- Bench tested on actual hardware: We cycled this pack through the TDD12 charger three full charge-discharge cycles. The charger's delta-V termination triggered correctly at full charge each time, and the BMS held stable current draw through repeated motor-start pulses without tripping the overcurrent cutoff.
- Ni-MH break-in on the TDD12: On first use, run two full discharge-recharge cycles at moderate load before driving at maximum torque. Ni-MH cells in this pack reach rated capacity after conditioning — cells shipped in a partial state and the charger's delta-V circuit reads more accurately once the pack has cycled through its full voltage window twice.
BMS overcurrent trip on TDD12 trigger-pull inrush
The TDD12 motor draws a short inrush spike the instant the trigger is pulled — this can be three to five times the steady running current. A freshly installed Ni-MH pack that hasn't been conditioned may cause the BMS to read that spike as an overcurrent fault and cut the output rail. The tool stops immediately, often after just one or two trigger pulls. Running two moderate-load conditioning cycles first allows the BMS to establish the correct overcurrent threshold against the motor's actual inrush profile.
TDD12 runs weak and bogs under load — voltage sag diagnosis
If the drill slows noticeably when driving into dense material, the cause is usually voltage sag — the pack's output rail drops under sustained current draw. On Ni-MH chemistry this often means the contact springs in the battery bay have oxidised, adding resistance between the pack terminals and the tool's motor controller. Clean both the battery contacts and the bay contacts with isopropyl alcohol. If sag persists after cleaning, check rail voltage under load — a healthy 12V Ni-MH pack should not drop below 10.5V during a full-torque drive cycle.
Compatible Models
Replaces Part Numbers
Technical Specifications
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 TDD12 cuts out the instant I pull the trigger — does the battery need to be primed first?
Yes. A new Ni-MH pack ships in a partial state of charge, and the BMS hasn't yet profiled the TDD12 motor's inrush spike. That spike can trip the overcurrent protection before the tool even starts moving. Run two full charge-discharge cycles at moderate load before using maximum torque — after conditioning, the BMS threshold calibrates correctly to the motor's start current.
The Festool charger shows a solid charge light but the pack never seems full — what's happening?
The TDD12 charger uses delta-V termination, which detects the small voltage drop that signals full charge in Ni-MH cells. A pack coming out of long storage may have cell voltage so flat that the charger can't detect that drop and either terminates early or cycles in a trickle loop. Pull the pack from the charger, let it rest for 15 minutes, then reinsert it. If the charger still won't complete a full charge, manually discharge the pack through the tool at light load until it stops, then charge from fully depleted — this resets the delta-V baseline.
The TDD12 drives fine on short screws but bogs badly on longer fasteners into hardwood — is this a battery fault?
That symptom points to voltage sag under sustained high-torque draw, not a capacity problem. Check the contact springs in the battery bay first — oxidised or compressed springs add resistance and the voltage drop shows up immediately under load. Clean both the pack terminals and bay contacts with isopropyl alcohol and a cotton bud. Under a full-torque sustained drive, the pack's output should hold above 10.5V — if it drops further than that after cleaning, the cells may need a full conditioning cycle to recover rated capacity.
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