A DPF apparatus includes: a container; an exhaust inlet pipe; a diesel particulate filter; a pair of perforated plugs; a pair of partition plates; and a diffusion chamber. The sign-holding portion of the mounting bracket features at least one channel. If the power source has not failed, the processing logic repeatedly and sequentially causes each battery to discharge while at least one of the remaining batteries remains fully charged, and monitors the power provided by the discharging battery.