Battery Life
The P400 housed a removable Li-Ion 900 mAh battery, delivering a standby time of up to 140 hours and a talk time of up to 5 hours. The flexibility of switching to a slim 720 mAh battery was an added convenience, offering standby and talk times of up to 120 hours and 4 hours respectively. For its size and capabilities, the battery performance was fairly reasonable, giving users flexibility and adequate usage duration without frequent recharging.