This is the Traxxas 2200mAh 7.4-volt 2-cell 25C LiPo with iD Auto Battery Identification

Features:
Semi rigid construction does not require a hard case and eliminates wire harness connectors that can loosen and fail
Engineered specifically to fit Traxxas models
16AWG multi strand wire is soldered directly to the LiPo cells eliminating increased resistance from bullet connectors and accidental reversed polarity connections
Includes:
Traxxas Power Cell 7.4V 2200mAh 25C LiPo 2S Battery with High Current Connector and JST/XH Balance Plug
Requires:
Balancer and LiPo compatible charger or LiPo charger with built-in balancer such as the Onyx 235 DTXP4235 LiPo charging bag
Comments:
ALWAYS use a LiPo-approved Charger
ALWAYS use a LiPo Cell Balancer
NEVER Charge over 4.20V per cell
NEVER Charge at currents greater than 1C
NEVER Charge through the To ESC or DISCHARGE lead
NEVER Trickle Charge
NEVER allow to Discharge below 2.5V per cell
NEVER disassemble or modify pack wiring in any way or puncture cells
NEVER place on combustible materials or leave unattended during charging
ALWAYS Charge in a fireproof location
ALWAYS set charger's output volts to match battery volts
ALWAYS keep out of reach of children