W/jst connector. This is a li-poly 2s 240mah battery pack from protek r/c. This super light weight micro size li-poly battery is designed to power small lightweight aircraft usually flown indoors. This lightweight li-poly 30c battery pack is designed to fit radio controlled planes and helicopters that use a 22 x 39 x 12mm 2s battery. These are a true 25c battery pack, and with a full 30c discharge capacity and light weight, these batteries are a power house for compatible helicopters and airplanes. This battery is also a perfect fit in the battery tray of the orlandoo hunter line of micro trucks! Specifications: capacity: 240 mah weight: 18 grams (including wire and connector) li-po cell arrangement: 2s1p nominal voltage: 7. 4 volts discharge capability: 30c continuous (6a), 50c max (12a) dimension(mm): 22 x 39 x 12mm connector: jst style recommended application: small indoor type aircraft. Important: 1) do not leave the battery in your model when charging 2) do not leave unattended when charging 3) always balance charge the battery 4) always use a lipo charging bag 5) you must use a li-poly specific charger to charge the pack (nimh or nicd only chargers will not work!) 6) you must not over discharge the li-poly battery pack 7) read & understand the instructions carefully before operating this battery note: when using high energy li-polymer batteries, please do not over-discharge or over-charge batteries as this will result in over heated batteries. Discharging capacity can't exceed 80% of the max capacity of the pack after full charging to ensure a good cycle performance. It is recommended to fully charge a brand new battery before using and only discharge the battery 50% for first 5 cycles. Always monitor race time and/or set a low voltage warning on esc (end voltage cannot be lower than 3. 2v per cell). Do not use the battery that has too low a voltage. Do not expose batteries to sunshine or store/charge batteries at the temperature above 35°c or in a closed car. The high temperature environment could cause damage to the pack or make it burst. If the battery becomes hot while fast charging, high current discharging or racing, do not charge the battery until it has cooled completely. Wait about 20 mins, then inspect prior to recharging. (ptk-5185)