specifications:
- Battery Charging Input: 5V/500mA typical via Micro USB port
- Power Supply Output: Switched 5VDC via USB type A port, 3x 5VDC (up to 4A) connectors, and 3x 3VDC (up to 1A)
- System Status Indicators: Battery Charging & Battery Charged LEDs
- Battery Protection Mechanism: Battery Overcharge & Deep Discharge
Quick breakdown into key components
The background electronics are a clever blend of three requisite circuits, that is to say, a lithium-ion battery charger circuitry, a battery protection circuitry, and a dc-dc boost converter circuitry. Refer to the annotated image provided below (and the table next to it) to get a deep insight on the underlying electronics.
| COMPONENT | DESCRIPTION |
| U9 = DW01V | 1S Li-Ion battery protection chip |
| F1 = 8205A | Dual N-Channel MOSFET |
| U2 = TC4056A | 1S Li-Ion battery charger chip |
| U7 = FP6298 | 4.5A current mode dc-dc boost converter chip |
| U4,U5,U6 = 662K (XC6206xxxx) | Positive voltage regulator chip (3.3V) |
| L1 = Green LED | Battery CHGD indicator |
| L2 = Red LED | Battery CHRG indicator |
| S1,S2,S4 = Schottky Diodes | S1 = SS14 & S2,S4 = SS24 |
In the 18650 Battery Development Board , the dc- dc boost converter chip is used to deliver 5VDC (actually 4.99V) through the USB ‘A’ socket and 5V male-header points, generated from the available 3.7V-4.2VDC Li-Ion battery output. The second channel output, marked as 3V but 3.3V on the dot, is supplied by the parallel combination of three positive voltage regulator chips. The 3.3VDC supply is derived from the 3.7V-4.2VDC Li-Ion battery output (not from the 5VDC output).
Package include:
- 1 pcs 18650 Battery shield V3 (does not include 18650 battery)
- 1 pcs cable
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