Sencor SVX 047 Cordless Vacuum Replacement Battery 25.9V 2500mAh

Sencor SVC 0725BK / SVC 8725GD / SRV Series — 25.9V Li-ion Replacement Battery (SVX 047)

This is a 25.9V Li-ion battery rated at 2500mAh (64.75Wh), built to replace the SVX 047 pack in Sencor cordless stick vacuums. It fits the SVC 0725BK, SVC 8725GD, SRV 4250, SRV 6250, and two additional models in the same family. The voltage and connector match the original spec, so the vacuum's motor controller sees no difference at startup.

• SVC and SRV series compatibility: These models share the same 25.9V (7S Li-ion) voltage rail, identical pack dimensions, and the same BMS handshake protocol. That is why one part number — SVX 047 — covers the whole family. Swapping between models in this group does not require any adapter or firmware change.
• Bench tested on actual hardware: We ran this pack through full charge and discharge cycles on a SVC 0725BK unit. The BMS balanced all cells correctly, held the motor start surge without tripping overcurrent protection, and the vacuum's battery indicator tracked charge level accurately throughout.
• Dock charging habit on this vacuum: Do not leave the SVC 0725BK sitting on the charging dock permanently. Continuous trickle charge causes capacity fade on Li-ion packs significantly faster than normal cycle use. Charge to full, then remove the vacuum from the dock until the next use.

Suction dropping before the battery indicator reaches low

This happens when the motor draws more current than the BMS expects, usually because a partially blocked filter is forcing the motor to work harder. The pack voltage sags under the increased load, and the motor controller reduces power to protect the system — even though the battery still has charge remaining. The indicator reads the resting cell voltage, not the loaded voltage, so it shows green while suction is already weak. Clean or replace the filter first, then recharge; if suction recovers, the battery is not the cause.

Motor cuts out mid-clean then comes back after a short pause

This is a BMS overcurrent trip, not a dead battery. Sustained restricted airflow — from a packed dust cup or clogged cyclone — forces the motor into a high-current stall condition. The BMS cuts power to protect the cells, waits a few seconds to cool the circuit, then allows restart. It will keep happening until the restriction is cleared. Empty the dust cup, check the cyclone mesh for blockage, and confirm the filter is clean before assuming the battery is faulty.