This is a 18650 battery with wire, JST connector You can directly use this 18650 battery to give power to any device which needs 3.7v or under. Need a big battery for your project? This lithium-ion battery contains a 1500mAh with wire and connector. Yet, it is slim and easy to fit into many project cases. This cell can provide 2C of peak current (4400mA). Note that these batteries are not designed to sustain such high loads, we suggest keeping any constant current draw under about 0.5C (1 Amp). The battery comes with color-coded wires, but to use with our chargers you'll likely want to connect a JST 2-pin cable (included!). Because they have a genuine JST connector, not a knock-off, the cable won't snag or get stuck in a matching JST jack, they click in and out smoothly. The cables are rated for 2A so if you use them keep that in mind.
Additional safety notes: Do not use a NiMH/NiCad/lead-acid charger! Also, do not abuse these batteries, do not short, bend, crush or puncture. Never charge or use unattended. Always inspect batteries and surrounding circuitry constantly for any damage, loose wiring, or the possibility of short circuits. As with all Lithium-ion polymer batteries and with any power source - they should be used by experts who are comfortable working with power supplies