The 
Nuprol Power 7.4v LiPo Battery 600mAh 20C is an airsoft and general RC hobby battery known for its compact size and high discharge rate, available with various connectors like Deans/T-connector, Mini-Tamiya, or AEP-specific plugs. It offers improved performance over standard NiMH batteries, but requires specific LiPo charging procedures. 
 
Key Specifications
Attribute 
Detail
Source
Chemistry
LiPo (Lithium Polymer)
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Voltage
7.4v (2S cell count)
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Capacity
600mAh
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Continuous Discharge Rate
20C @ 12A
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Burst Discharge Rate
40C @ 24A
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Configuration
PDW / Stick type (designed for tight spaces)
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Dimensions
70 x 16 x 16 mm (varies slightly by connector type)
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Weight
Approximately 44-60g
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Balance Connector
JST-XH
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Important Safety & Usage Information
Charger: You must use a compatible LiPo balance charger; using a standard charger can be dangerous.
Charging Safety: Always charge the battery inside a fire-retardant LiPo safety bag and do not leave it unattended during the charging process.
Storage: Store the battery in a cool, dry place at a storage voltage of approximately 3.7V per cell (around 60% charge) when not in use.
Discharge: The battery should not be completely "run flat" as this can damage it and affect its charging ability.