2PCS 123555 2500mAh 3.7V Li-Polymer Rechargeable Battery with Protection Board for Warmer Power Light Cervical Spine Heater

Description

Package content: 2 x batteries (sold as 2pcs/lot)
Battery model: 123555
Capacity: 2500mAh / 9.25Wh (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): 12 x 35 x 55mm / 0.47 x 1.38 x 2.17 inches
Discharge current: 0.5C (1250mA)
Charge current: 0.5C (1250mA)
Connection: 2-wire pigtail (Red wire “+” Positive, Black wire “-” Negative) — no connector
Compatible with: Warmer, Power Light, Cervical Spine Heater, Heating Suit, Electric Hand Warmer, Portable Heated Apparel, DIY 3.7-5V Electronic Projects
Power up your portable warming devices with this 2‑pack 123555 2500mAh rechargeable Li‑Polymer battery set. Perfect for cervical spine heaters (neck heating pads), power lights, electric hand warmers, heating suits, heated jackets, gloves, and various DIY 3.7V electronic projects requiring a compact power source. Each battery delivers factory‑rated 2500mAh capacity with built‑in protection against overcharge, over‑discharge, short circuit, and overcurrent — essential safety features for heating applications.
Manufactured with high‑quality Grade A Li‑Polymer cells and equipped with integrated PCM protection board. The protection features include overcharge protection (detection 4.30±0.05V), over‑discharge protection (detection 2.50±0.1V), overcurrent protection (2.5±1.0A), and short circuit protection. With a cycle life of 500 cycles maintaining 80% capacity, these batteries offer reliable long‑term performance for repeated charging cycles. CE, RoHS, and UN38.3 certified for safe transport and use. Operating temperature range: charge 0‑45°C, discharge ‑20 to 60°C — the wide discharge temperature range makes these batteries suitable for use in cold conditions.
Compatibility Note: Fits devices that use 123555 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: 12mm thickness × 35mm width × 55mm length — measure your battery compartment to ensure proper fit. Suitable for DIY electronic products with power consumption less than 9.25Wh. Not suitable for high‑power power tools or drones.
Installation Tip: If your original battery has a connector (JST PH‑2P or similar), you can 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. For heating devices, allow the battery to cool between high‑discharge cycles to extend lifespan. Always use a compatible charger with correct polarity. Store in a cool, dry place when not in use.