DALY BMS for LiFePO4 4S–16S Battery Protection 15A–200A

The DALY 4S–16S BMS is a compact, sealed protection board that safely manages LiFePO4 battery packs (including 4S 12V setups) with balancing, temperature sensing, and multi-point protection up to 200A.

Designed for e-bikes, solar storage, RVs, marine systems and DIY battery builds, this DALY Battery Management System combines a space-saving sealed enclosure with over-charge, over-discharge, over-current, short-circuit and temperature protections. The module adds passive balancing (100mA) and a pre-charge function to reduce inrush current, while the included balance wire and temperature sensor let the board monitor individual cells and ambient pack temperature. The unit is manufactured following international safety standards and is suitable for LifePO4 chemistry and similar lithium cells.

How does this BMS protect my battery pack during charge and discharge?

The DALY BMS continuously monitors cell voltages and pack current to prevent damaging charge or discharge conditions. If voltages exceed safe thresholds or current surges occur, the board disconnects the pack and isolates faults until conditions normalize.

• Over-charge and over-discharge cutoffs to protect cells
• Over-current and short-circuit detection for immediate shutdown
• Temperature sensor input to avoid charging in unsafe thermal conditions
• ISO / FCC / RoHS / PSE / CE approvals for compliance

What balancing and pre-charge features are included?

This DALY model offers passive cell balancing at about 100mA to keep individual cell voltages aligned during regular use and charging cycles. The built-in pre-charge function reduces inrush current when connecting large loads or capacitive systems, protecting relays and contactors.

• 100mA passive balancing current for steady cell equalization
• Pre-charge circuit to limit startup current spikes
• Low temperature rise during balancing for improved longevity
• Consistent charge/discharge current performance across cycles

Which configurations and currents does this DALY BMS support?

The DALY 4S–16S family covers many nominal cell counts so you can choose a version that fits your pack size; the listed product supports common 4S LifePO4 12V packs and higher cell counts up to 16S. Current handling ranges from 15A up to 200A depending on the selected model—confirm the amperage variant to match your application.

• Compatible with 4S (12V) LiFePO4 packs and up to 16S configurations
• Available in rated currents from 15A through 200A—select by model
• Includes balance harness and external temperature sensor for accuracy
• Compact sealed case for dustproof, shockproof and splash resistance

How easy is it to install and maintain this BMS?

The module uses a plug-and-play approach with labeled balance wire connectors and a removable temperature sensor for straightforward wiring in DIY or professional builds. Its injection-molded sealed case simplifies mounting and helps protect electronics from dirt and vibration.

• Plug-and-unplug connectors for faster, safer installation
• Injection-molded sealing for dustproof and shock-resistant protection
• Compact footprint that fits tight enclosures and retrofit projects
• Lifetime technical support and optional accessories available from DALY

Who is this for: The DALY 4S–16S BMS suits hobbyists building LiFePO4 battery packs, technicians retrofitting e-mobility systems, and professionals designing off-grid energy storage who need reliable protection, passive balancing and temperature monitoring. Choose the correct current-rating variant (15A–200A) and cell-count version for your pack, and contact DALY support if you require active balancing, communication modules, parallel kits or other smart accessories.