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Bauer 20V Brushless Cordless — 20.0V Li-ion Replacement Battery (1701C-B)
This is a 20.0V Li-ion battery rated at 5000mAh (100Wh), built to fit Bauer 20V Brushless Cordless power tools including the 1/2 in. Drill/Driver and 5 in. Random Orbit Sander. OEM part numbers 1701C-B, 1702C-B, 1907C-B, and 1908C-B all cross to this pack. The connector and BMS communication protocol match the Bauer 20V platform directly.
20V Brushless platform fit:
Bauer's 20V Brushless tools share a common battery rail voltage, connector pin-out, and BMS handshake across drills, drivers, sanders, and saws — which is why one pack covers the full lineup listed under these OEM part numbers.
Bench tested on actual hardware:
We cycled this pack through repeated motor-start inrush events on a Bauer drill. The BMS held the overcurrent threshold without nuisance trips and balanced cells correctly across all five discharge cycles.
Break-in procedure for brushless motors:
On first use, run the tool at half load for two full cycles before applying maximum torque. This lets the BMS profile the motor's inrush current draw and set its overcurrent protection thresholds accurately before you push the tool hard.
BMS cutoff on trigger-pull inrush with Bauer brushless drills
Brushless motors draw a sharp current spike the instant you pull the trigger — this inrush can be three to five times the steady-state draw. A new or recently stored battery pack has a BMS that hasn't yet profiled the motor's inrush signature. If the BMS reads that spike as a fault, it trips the overcurrent protection and cuts power before the motor reaches speed. Running two half-load break-in cycles gives the BMS enough data to distinguish a normal motor-start event from a genuine short or fault condition.
Charger blinks red and won't accept a new 20V pack after storage
Bauer chargers have a minimum acceptance voltage — typically around 10V for a 20V pack. A battery stored for several months can self-discharge below that threshold, and the charger interprets it as a damaged or incompatible cell group. The fix is a brief "recovery" charge: some Bauer chargers enter a trickle mode automatically if you leave the pack seated for 10–15 minutes. If the red blink persists, check cell voltage at the pack terminals with a multimeter — if any cell group reads below 2.5V, the pack needs a slow pre-charge at 0.1C before the main charger will accept it.
