SINGAPORE, Oct. 21 -- A family of seven were trapped in their Yishun HDB flat on Monday after a personal mobility aid (PMA) battery caught fire in the corridor.

According to AsiaOne, the family owns three PMAs - two for the grandparents and one for the mother, 51, a food delivery rider.

The devices had been used safely for three years with original batteries, but the mother had borrowed a cheaper replacement that ignited shortly after being plugged in.

The blaze quickly spread, igniting another PMA.

The family barricaded themselves inside, with four-month-old granddaughter suffering minor smoke inhalation, but no one else was seriously injured.

The Singapore Civil Defence Force (SCDF) extinguished the fire and evacuated around 25 res...