This is the Onyx 7.4V 5000mAh 35C Hard Case LiPo Battery with the Star Plug.

Ultrasonically welded cell tabs and balancing wires
light weight and economical for sport use
2-year limited warranty-Onyx brand batteries are warranted to be
free from defects in materials and workmanship for a period of two
years from the date of purchase. During the first twelve months,
ONYX will, at our discretion, repair or replace without service
charge any product deemed inoperable due to those causes.
After the first full year of warranty coverage ONYX will provide
extended warranty coverage for another 12 months covering only
defects in materials and workmanship. Extended coverage is limited
and does not cover problems caused by abuse, misuse, and improper
maintenance, failure to follow instructions, ordinary wear, or use
past the battery's maximum rated number of cycles.

7.4V 5000mAh 35C Hard Case LiPo Battery with Star Plug connector and JST-XH Balancing Plug

Balancer and LiPo compatible charger or LiPo charger with built-in balancer

Voltage Rating: 7.4V
Rated Capacity: 5000mAh
Maximum Charge Rate: 20.0A/4C
Discharge Rate: 35C
Burst Rate: 60C/350A
Dimensions, L, W, H: 5.4 x 1.8 x 0.94" (137 x 46 x 24mm)
Weight: 9.9oz (280g)
Discharge Lead Wire Size: 12AWG
Discharge Lead length: 4" (102mm) not including connector
Discharge Connector: Star
Balancing Connector: JST-XH
Watt Hours: 37

ALWAYS use a LiPo-approved Charger
ALWAYS use a LiPo Cell Balancer
NEVER Charge over 4.2V per cell
NEVER Charge at currents greater than 4C
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
All weights include wire leads and plugs
All weights +/- 1 g
All measurements +/- 1 mm