About this replacement
Craftsman FS2600 Series — 19.2V Li-ion Replacement Battery (11371)
This is a 19.2V Li-ion replacement battery rated at 4000mAh (76.8Wh) for the Craftsman FS2600 cordless string trimmer. It also fits the CR2100, 115920, 115970, and over 65 additional models on the Craftsman 19.2V platform. OEM part numbers covered include 11371, 11374, 11375, 11376, 17300, 130285003, PP2000, PP2010, PP2011, PP2020, PP2025, and PP2030.
- 19.2V platform fit: These models share a common 19.2V rail, connector pinout, and BMS handshake protocol. The pack communicates state-of-charge data back to the tool's controller, so the voltage signature and cell count must match exactly — this pack does.
- Bench tested on actual hardware: We ran this pack through full charge-discharge cycles on the FS2600 trimmer and CR2100 drill. The BMS held cutoff thresholds correctly under both light-draw trimming and higher-inrush motor start events, with no false overcurrent trips.
- Break-in on the FS2600 motor: On first use, run the trimmer at half-throttle for two cycles before full-load cutting. This lets the BMS log the motor's inrush current signature and calibrate its overcurrent protection threshold before you push the pack hard.
BMS cutoff on trigger pull — why the FS2600 shuts off instantly on start
String trimmer motors draw three to five times their running current in the first 50–100 milliseconds after trigger pull. If the BMS overcurrent threshold is set too conservatively — or if the pack is cold — that inrush spike can trip the protection circuit before the motor even spins up. A new pack from storage may also have unbalanced cells, which makes one cell group hit its voltage floor faster than the others during inrush. Running two break-in cycles at reduced throttle allows the BMS to profile the actual inrush curve before it finalises its trip threshold.
Charger LED blinking red on a new pack after storage
Craftsman 19.2V chargers include an acceptance voltage check — if any cell group reads below roughly 2.5V per cell, the charger refuses to start a full charge cycle and signals the fault with a red blink pattern. Packs sitting unused for several months self-discharge past this threshold. Place the pack in the charger for 30–60 seconds, remove it, wait 10 seconds, and re-seat it — this can trigger the charger's recovery mode. If the charger still blinks red after three attempts, check rail contact resistance and confirm terminal voltage with a multimeter; you should read at least 15V across the main terminals before the charger will accept the pack.