What is the charging time for the TPS2000 series batteries?

What is the charging time for the TPS2000 series batteries?

Batteries can be charged either in the instrument or in the optional TPSCHG external charger. In the external charger, a battery will charge in 3 hours.

When AC power is supplied to the TPS2000, a battery will charge in about 4.5 hours if the instrument is turned off, and in about 7 hours if the instrument is in use.