DALY SMART BMS LFP 4S 40A R24K

DALY SMART BMS LFP 4S 40A

The DALY SMART BMS LFP 4S 40A is intended for a four-series-cell lithium iron phosphate battery pack. The 4S designation identifies the cell arrangement, while 40A identifies its current class. Four LFP cells rated at 3.2V nominal form a 12.8V nominal pack in series. Selection depends on load, charging requirements and board configuration.

A battery management system monitors battery conditions and controls charge and discharge paths. A 4S LFP BMS is designed for four series-connected LFP cell groups; it is not interchangeable with an NMC board because the chemistries use different voltage limits. DALY describes its Smart BMS range as supporting LFP packs and Bluetooth app monitoring. Match the exact 4S 40A model, ports, accessories, balancing method and charge-current limit to the supplied board.

A 4S pack uses five voltage-sampling points, normally labelled B0 to B4, to monitor pack negative and each series junction. DALY's 4S wiring guidance specifies a five-pin sampling cable and stresses correct connection order and voltage checks before power-up. Smart-series configurations support app monitoring; communication options depend on the board. Protection thresholds, balancing current, charging limit, peak current and ingress rating require the exact model datasheet.

Use this BMS only with a four-series LiFePO4 pack whose voltage limits and load profile match the board. Confirm that 40A meets the continuous discharge requirement; check charging limit, transient current and charger output separately. Match port design, connector, balance harness, temperature-sensor provision and communication interface. Confirm Bluetooth inclusion and compatible accessories for app monitoring. Use an LFP-compatible charger and matched cells. Buyers comparing a 12.8V 4S LiFePO4 BMS, DALY 4S 40A battery protection board or smart LFP BMS in India should compare electrical and interface details, not current rating alone.

Applications

• 12.8V LFP battery packs - for compatible four-series cell assemblies.

• Solar and backup systems - where pack voltage and load suit the board.

• Portable power equipment - for appropriately designed 4S LFP packs.

• EV auxiliary systems - where the 4S voltage and current are suitable.

• Battery service work - when the original BMS arrangement and wiring match.

Installation Guide

A battery technician should install the board using its wiring diagram. Isolate the pack and load, inspect cell voltages, and identify all five balance-wire points. Follow the specified B0-to-B4 order and verify each voltage before connecting main negative and output leads. Fit sensors and communication accessories only to designated sockets. Insulate exposed conductors, secure the board, and test the pack before service. Never guess wire order or bypass protection.

Why Choose ARB Accessories?

ARB Accessories supplies BMS units, cells, battery packs, connectors and wiring for battery builders and EV service teams in India. For a new build or replacement, match chemistry, 4S arrangement, current, board model, port type and communication needs. Select the exact DALY model and accessory set; do not substitute hardware BMS for Smart BMS or choose by brand and ampere rating alone.