Medium Pack BMS 5S to 13S — 36V 48V

stem.pk stocks medium-range BMS protection boards for 5S to 13S lithium battery packs — covering 18V (5S) to 48V (13S) nominal voltages. These BMS boards are the backbone of e-bike battery packs, electric scooters, power tool batteries, and mid-scale solar storage systems in Pakistan. With current ratings from 20A to 100A and built-in cell balancing, they keep your lithium pack safe and healthy for thousands of cycles.

Why Medium-Pack BMS?

E-bike voltage range — 10S (36V) and 13S (48V) are the standard voltages for electric bicycle motors in Pakistan
High current handling — 30A to 100A continuous for powerful hub motors and mid-drives
Cell balancing included — passive balancing maintains cell equilibrium across all series cells
Temperature protection — NTC sensor input cuts output if pack overheats under load

Available Configurations

5S BMS — 18V nominal; for power tool replacement packs
6S BMS — 22.2V; for drone packs and medium power tools
7S BMS — 25.9V; for specialty applications
8S BMS — 29.6V; for industrial portable equipment
10S BMS — 36V nominal; standard for entry-level e-bikes
13S BMS — 48V nominal; standard for high-performance e-bikes and scooters in Pakistan

Related Categories

See smaller packs at Small Pack BMS (1S–4S). For high-voltage solar systems see High Voltage BMS (14S–24S). For e-bike specific rated BMS see BMS for E-Bike & Electric Scooter. Pair with 18650 cells from Batteries & Chargers.

Common Applications

E-bike conversion — 13S 18650 pack (48V, 10–20Ah) + 30A–60A BMS + BLDC hub motor
Electric scooter battery — 10S LiPo or 18650 pack with high-current BMS
Power tool battery rebuild — 5S replacement for 18V drill/saw packs
Solar storage mid-scale — 10S LiFePO4 with appropriate LFP-calibrated BMS
Robot drive battery — 6S or 7S high-current BMS for heavy mobile robots

How to Choose

Match series count — 10S for 36V systems; 13S for 48V systems
Current rating — peak motor current × 1.5 = minimum BMS current rating
Chemistry — Li-ion BMS for 18650/LiPo; LiFePO4 BMS for LFP cells
Port type — common port for simpler wiring; separate port for simultaneous charge/discharge

Learning Resources

Cell Balancing — Battery University
BMS — Wikipedia
DIY Solar Forum — community discussion on BMS selection for various pack sizes
48V E-Bike BMS Wiring — YouTube

Need cells for your pack? Browse Batteries & Chargers. See all BMS options at BMS - Battery Management Systems. For bulk e-bike battery assembly supply contact info@stem.pk.