The DFRobot Battery Capacity Indicator (DFR0939) is a compact LED bar display module that shows the remaining charge level of a Li-ion or LiPo battery at a glance. With no microcontroller required for basic operation, it reads battery voltage directly and illuminates the appropriate LED segments to indicate charge percentage. An essential add-on for any battery-powered project where knowing remaining runtime matters. Specifications Model: DFR0939 Input Voltage Range: 3.0V – 4.2V (1S LiPo / Li-ion) Display Type: LED bar graph indicator Indication Levels: Multiple LED stages showing charge percentage Operating Current: Low power (indicator only) Dimensions: Compact PCB format Output: Visual LED indication only Key Features Instant visual battery level indication via LED bar graph Designed for 1S LiPo and Li-ion batteries (3.0V–4.2V) No configuration or programming required — plug and read Compact form factor fits into tight enclosures and maker builds Low self-consumption — does not significantly drain the monitored battery Ideal for robots, RC vehicles, portable electronics, and drones Clear visual feedback helps prevent LiPo over-discharge Works standalone or mounted inside a project enclosure Applications LiPo battery level monitoring in robots and drones Portable maker projects with battery power status display RC vehicle battery gauges Solar-charged battery monitoring STEM education power management demonstrations Wearable electronics battery level feedback DIY power banks and UPS systems Field equipment battery status needs Package Includes 1x DFRobot Battery Capacity Indicator (DFR0939) Note: Battery sold separately. Compatible with 1S LiPo / Li-ion (3.0V–4.2V). FAQ Q: Does this work with 2S or 3S LiPo? A: No — designed for 1S (single cell) batteries only (3.0V–4.2V). Q: How accurate is the indication? A: LED bar indicators provide approximate levels (typically 4–5 stages). For precise readings, use a fuel gauge IC. Q: Can I connect this permanently? A: Yes — low self-consumption makes it suitable for always-on monitoring. Q: Does it protect against over-discharge? A: No — indicator only. For protection, use a BMS (Battery Management System). Q: What connector does it use? A: Check the product listing — most DFRobot battery modules use JST-PH 2.0mm connectors.
