2PCS 503450 1000mAh 3.7V Li-Polymer Rechargeable Battery with Protection Board for Speaker

Description

Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 503450
Capacity: 1000mAh / 3.7Wh (per battery)
Rated voltage: 3.7V
Charge limit voltage: 4.26V (max)
Discharge cut-off voltage: 2.75V
Battery type: Li-Polymer (Grade A cells with built-in PCM protection board)
Dimensions (single): 5 x 34 x 50mm / 0.20 x 1.34 x 1.97 inches
Discharge current: 0.5C (500mA)
Charge current: 0.5C (500mA)
Connection: 2-wire pigtail (Red wire “+” Positive, Black wire “-” Negative) — no connector
Compatible with: Speaker, Bluetooth Speaker, Portable Audio, Small Fan, LED Light, DIY 3.7V Electronic Projects
Power up your portable speakers and electronics with this 2‑pack 503450 1000mAh rechargeable Li‑Polymer battery set. Made with genuine Grade A lithium cells, these batteries are perfect for Bluetooth speakers, portable audio devices, small fans, LED lights, and various DIY 3.7V projects. Each battery delivers factory‑rated 1000mAh capacity with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent — ensuring safe and reliable operation for audio devices.
Manufactured with high‑quality Grade A Li‑Polymer cells and equipped with integrated PCM protection board. The protection features include overcharge protection (detection 4.26±0.05V), over‑discharge protection (detection 2.75±0.1V), overcurrent protection, and short circuit protection. With a cycle life of 500 cycles retaining 80% 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 503450 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: 5mm thickness × 34mm width × 50mm length — the ultra‑slim profile fits easily inside speaker housings. Suitable for DIY electronic products with power consumption less than 3.7Wh. Not suitable for high‑power power tools or drones.
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 5V USB charger with appropriate charging circuit protection. Store in a cool, dry place when not in use.