A little replacing of numbers found these documents, also;
"Caution
The battery pack used in this device may present a fire or chemical
burn hazard if mistreated. To prevent from exploding or releasing
toxic materials, do not disassemble, heat above 140°F (60°C) or
incinerate. To prevent burns, do not short-circuit.
Rechargeable Battery Pack (PRSA-BP9)
Maximum Charge Current: 1.0 A
Maximum Charge Voltage: 4.23 V"
https://www.sonystyle.com/wcsstore/S...set-180369.pdf
"This doc shows how to install the supplied battery, as well as, the battery PN PRSA-BP9."
https://www.sonystyle.com/wcsstore/S...set-180370.pdf
"Note on browsing PDF documents using the Reader (SONY 900)"
https://www.sonystyle.com/wcsstore/S...set-180371.pdf
Missed this one... Four pages put together!
https://www.sonystyle.com/wcsstore/S...set-180372.pdf
Gunner...