Tl:dr use better chargers basically
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This took a bit to understand before the picture finally loaded on a refresh lol. I feel like i need to add in some data on this as it seems a bit overblown and poorly explained as mazdas side.
The chance of a battery device(basically any phone or maybe GPS with internal battery) backfeeding an entire car seems like its more of a charger problem if people are using those dirt cheap chargers either from aliexpress ebay or those throwaway chargers on counter of stores that dont properly regulate charging. You would also need to have a device capable of reverse charging which some devices (not all)with 5000+mah battery might support but the processing of the charger should stop and not allow backfeeding. It feels like a extremely rare use case since the phone system has safety checks on how much power to back feed out and the charger sould have to accept the current with no regulation on heat or volt/watt etc would require a perfect environment to have a car basically run off of your phone. Im trying to imagine the wiring plot of connections needed to have this happen and it seems like its rather a poor implementation of push to start on mazdas part otherwise this would be an international issue for every make and model vehicle. To have a shutdown process terminated from a backfeed seems like a grossly overlooked detail since the feed pulled from a charger would be unregulated and cause damage to a phone in theory. The key connection still remains the charger used.
On the bright side i can confirm ive never had this happen thankfully using my chargers since they regulate for higher amp charging based on device plugged in.
Hopefully this alleviates anyones concern regarding this and thanks for OP for bringing it up
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This took a bit to understand before the picture finally loaded on a refresh lol. I feel like i need to add in some data on this as it seems a bit overblown and poorly explained as mazdas side.
The chance of a battery device(basically any phone or maybe GPS with internal battery) backfeeding an entire car seems like its more of a charger problem if people are using those dirt cheap chargers either from aliexpress ebay or those throwaway chargers on counter of stores that dont properly regulate charging. You would also need to have a device capable of reverse charging which some devices (not all)with 5000+mah battery might support but the processing of the charger should stop and not allow backfeeding. It feels like a extremely rare use case since the phone system has safety checks on how much power to back feed out and the charger sould have to accept the current with no regulation on heat or volt/watt etc would require a perfect environment to have a car basically run off of your phone. Im trying to imagine the wiring plot of connections needed to have this happen and it seems like its rather a poor implementation of push to start on mazdas part otherwise this would be an international issue for every make and model vehicle. To have a shutdown process terminated from a backfeed seems like a grossly overlooked detail since the feed pulled from a charger would be unregulated and cause damage to a phone in theory. The key connection still remains the charger used.
On the bright side i can confirm ive never had this happen thankfully using my chargers since they regulate for higher amp charging based on device plugged in.
Hopefully this alleviates anyones concern regarding this and thanks for OP for bringing it up
