I'm still using my iPhone 4S, but I have a Samsung S9 for backup in case it should fail. The power button is already gone, but I use the charging cable to power

I'm still using my iPhone 4S, but I have a Samsung S9 for backup in case it should fail. The power button is already gone, but I use the charging cable to power it on and pull the battery to power it off! I changed the battery on the 4S three times. Last year I meet a translator from Russia who had a 3GS with the original battery! That really made me regret I sent in my original iPod Nano when Apple said the batteries where dangerous and replaced them with a 6th gen for free, who's battery died only a year later! Now we know why, you can't sell light bulbs that last forever because the customer won't come back... one gen later the iPad Nano was gone from the market.