This is a Futaba NR4J Rechargeable NiCad Receiver Battery Pack for Futaba or compatible "J" style Radio Systems. This battery pack comes shrink-wrapped with wire and connectors pre-installed.
Weight: 3.3 ounce
Cell Size: AA
1x Receiver Battery Pack w/wire and "J" connector
Slow charge rate--60mA for 15 hours
Fast charge rate--180mA for 5 hours
These used to be 500mAh, but are now rated at 600mAh (6/00 NMH)