3.7V 450mAh Li-Polymer
7F18F18 Media Player Battery
For NS-2V17, NS-2V17B 2GB, NS-2V17B 4GB, NS2V17R, NS-4V17, NS-4V17B, NS-4V17R

3.7V 450mAh Li-Ion
DBP382636 Media Player Battery
For NS-DA1G, NS-DA2G 1GB, NS-DA2G 2GB

3.7V 560mAh Li-Polymer
E4H04-1-R Media Player Battery
For NS-4V24, NS-8V24