2PCS 605590 4000mAh 3.7V Li-Polymer Rechargeable Battery with Protection Board for Tablet Electronic Lights Lamp

Description

Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 605590
Capacity: 4000mAh / 14.8Wh (per battery)
Rated voltage: 3.7V
Charge limit voltage: 4.26V (max)
Discharge cut-off voltage: 2.75V
Battery type: Li-Polymer (with built-in PCM protection board)
Dimensions (single): 6 x 55 x 90mm / 0.24 x 2.17 x 3.54 inches
Discharge current: 0.5C (2000mA)
Charge current: 0.5C (2000mA)
Connection: 2-wire pigtail (Red wire “+” Positive, Black wire “-” Negative) — no connector
Compatible with: Tablet PC, Electronic Lights, LED Lamp, Portable Speaker, DIY 3.7V Electronic Projects
Power up your larger portable electronics with this 2‑pack 605590 4000mAh rechargeable Li‑Polymer battery set. Perfect for tablets (Android tablets, iPad replacement batteries), electronic lights (portable LED work lights, camping lights), LED lamps, Bluetooth speakers, and various DIY 3.7V electronic projects requiring a high‑capacity, slim 6mm thick battery. Each battery delivers factory‑rated 4000mAh capacity for extended runtime, with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent — essential safety features for reliable daily use.
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 a wide range of indoor and outdoor applications including winter use.
Compatibility Note: Fits devices that use 605590 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: 6mm thickness × 55mm width × 90mm length — the slim profile is ideal for tablets and flat devices. Suitable for DIY electronic products with power consumption less than 14.8Wh. Not suitable for high‑power power tools or drones.
Installation Tip: If your original battery has a connector (JST PH‑2P 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 — reversing polarity can damage both the battery and your device.
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.