2PCS 103665 3000mAh 3.7V Li-Polymer Rechargeable Battery with Protection Board for LED Lamp Photoelectric Equipment DIY

Description

Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 103665
Capacity: 3000mAh (Typical) / 11.1Wh (per battery)
Rated voltage: 3.7V
Charge limit voltage: 4.25V (max)
Discharge cut-off voltage: 2.75V
Battery type: Li-Polymer (with built-in PCM protection board)
Dimensions (single): 10 x 36 x 65mm / 0.39 x 1.42 x 2.56 inches
Weight: 46.5 g per battery
Discharge current: 1C (3000mA max)
Charge current: 0.5C (1500mA)
Connection: 2-wire pigtail (Red wire “+” Positive, Black wire “-” Negative) — no connector
Cycle life: 500 cycles retains ≥85% of original capacity with a service life of over 1000 cycles
Operating temperature: Charge 0-45°C, Discharge -20-60°C
Compatible with: Photoelectric Equipment, Electronic Lamp, LED Light, Solar-Powered Device, Sensor, Emergency Light, Portable Work Lamp, Bluetooth Speaker, DIY 3.7V Electronic Projects
Power up your photoelectric equipment and electronic lamps with this 2‑pack 103665 3000mAh rechargeable Li‑Polymer battery set. Made with high-quality Grade A Li-Polymer cells, these batteries are perfect for photoelectric sensors, electronic lamps, LED lights, solar-powered devices, emergency lights, portable work lamps, Bluetooth speakers, and various DIY 3.7V electronic projects. Each battery delivers factory‑rated 3000mAh capacity with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent — ensuring safe and reliable operation for your devices. For reference, third‑party retailers sell this battery for approximately $8 to $12 per battery.
Manufactured with high‑quality Grade A Li-Polymer cells and equipped with integrated PCM protection board. The protection features include overcharge protection (detection 4.25±0.05V), over‑discharge protection (detection 2.75±0.1V), overcurrent protection, and short circuit protection. With a cycle life of 500 cycles retaining 85% of original capacity and a service life of over 1000 cycles, these batteries offer exceptional long‑term durability. CE, RoHS, and UN38.3 certified for safe transport and use. Operating temperature range: charge 0‑45°C, discharge ‑20 to 60°C — suitable for indoor and outdoor use.
Compatibility Note: Fits devices that use 103665 battery model with 2‑wire connection. No connector included — red and black wires only, ready for direct soldering. Please verify your device’s original battery model and connection polarity before ordering (red wire = positive “+”, black wire = negative “-“). Battery dimensions: 10mm thickness × 36mm width × 65mm length — measure your battery compartment to ensure proper fit. Suitable for DIY electronic products with power consumption less than 11.1Wh. Not suitable for high‑power power tools or model aircraft.
Installation Tip: If your original battery has a connector (JST or similar), carefully cut and solder the plug from your old battery to these wires using heat shrink insulating sleeves to connect same color wires together (red to red, black to black). Always verify polarity before soldering and do not reverse the connection.
Battery Care Tips: Avoid full discharge — recharge when battery level drops below 20%. Do not expose to high temperatures or direct sunlight. New batteries require 3‑5 full charge cycles to reach optimal capacity. Always use a compatible 3.7V Li-Po charger with appropriate charging circuit protection. Store in a cool, dry place when not in use.