Heltec Energy 4S 5A Active Balancer with Voltage Display for LFP/NCM Battery Packs

The Heltec Energy DS0855 is a 4S active battery balancer with built-in voltage display for LFP and NCM battery packs.

This unit is designed for 4-series battery builds where cell balancing and real-time cell voltage visibility are useful during setup, testing, and maintenance.

Key features:
- 4S active balancing
- Built-in voltage display
- Supports LFP and NCM battery types
- Maximum balancing current up to 5A
- Balance voltage accuracy approximately 5mV
- Minimum balancing start voltage difference approximately 0.01V
- Displays total pack voltage and individual cell-string voltage
- No external power supply required
- Manual sleep/always-on button
- RoHS documentation available

Important:
This is an active balancer, not a BMS. It does not replace proper battery protection. A suitable BMS, fuse, wiring, and charger should still be used for a complete battery system.

Sodium-ion note:
This standard version is not intended for sodium-ion systems operated down to very low cell voltage. The balancer sleep threshold is approximately 2.7V for NCM/LFP use. For sodium-ion cells operated below that range, a lower-voltage LTO-range version may be required.

Included:
- 1x 4S active balancer with display
- 1x wiring harness
- Basic Saltra support notes

Spec:

Model: DS0855
Series count: 4S
Battery type: LFP / NCM
Display: Yes
Max balancing current: up to 5A
Balance voltage accuracy: approx. 5mV
Operating voltage range: 2.7V–4.2V for NCM/LFP
Sleep voltage: approx. 2.7V
Static operating current: approx. 13mA
Operating temperature: -10°C to 60°C
External power: Not required
Documentation: User manual and RoHS documentation available