
Touchstone®
STANDARD Revision 2 © 2016 ARRIS Enterprises LLC. All Rights Reserved. 2
Minimum 8-Hour Hold-up Time by Model
An 8-hour hold-up time means the device can support voice service for at least 8 hours. The actual talk time available is
5 hours. The following factors can affect hold-up time:
Battery age—most batteries have a service life (when the battery can provide the rated hold-up time) of at least 5
years. ARRIS warrants batteries for 1 year.
A high number of charge and discharge cycles—whether caused by frequent outages, or frequently disconnecting
power (by unplugging the unit or putting it on a switched outlet) can reduce battery service life.
Ambient temperature—rated capacity and service life assumes room temperature (72°F or 22°C). Lower
temperatures may increase service life while reducing capacity, and higher temperatures may increase capacity
while decreasing service life.
The following table shows the minimum battery size required to provide an 8-hour hold-up time for each listed model.
The following conditions apply:
The battery is new.
The battery is fully charged.
The battery remains at room temperature: 72°F (22°C) at all times.
Model Minimum Battery for 8-hour Hold-up Time
Model # Part # (single) Part # (10-pack)
TM602G BPB022S 790513 718003
TM604G BPB044S 790512 718005
TM608G BPB044S 790512 718005
WTM652G BPB026S 794068 789699
TM722G BPB044S 790512 718005
TM802G BPB026S 794068 789699
TM804G BPB026S 794068 789699
TM822G BPB026S 794068 789699
TG852G BPB026S 794068 789699
TG862G BPB026S 794068 789699
TM1602G, TM3202G BPB044S 790512 718005
TG1662G, TG1672G,
TG1682G, TG2472G
BPB044S 790512 718005
When installing or replacing a battery in a Touchstone device, it typically takes up to 72 hours to calibrate and charge.
The device repeats the calibration cycle:
After the battery has been totally depleted.