How Long Can a Car Battery Last After One Charge?
2 Answers
After one charge, a car battery can typically last from half a month to one month. Below are some relevant details about car battery usage: 1. Combined-use car batteries: Since car batteries are designed for short-term, high-current discharge (starting-type batteries) and are shallow-cycle type, while inverters require long-term, stable low-current discharge, it is advisable to use specialized energy storage batteries or traction batteries designed for electric vehicles. 2. Long-term unused batteries: Car batteries are lead-acid batteries and generally should not be left in a discharged state. They should be kept fully charged; otherwise, it may affect the battery's lifespan. To determine if a battery is fully charged, check for bubble production—bubbles indicate the battery is fully charged. For long-term unused batteries, they should be charged once every half month or month.
Last time at the repair shop, the mechanic told me there's no fixed rule for battery lifespan after charging. A new battery can easily last two to three weeks on a single charge, but for my 3-year-old car battery, making it ten days would be a blessing. The key is not to let the battery starve – for long-term parking, it's best to start the engine for 20 minutes weekly. Last week, my neighbor's BMW had a dead battery; they jump-started it and drove for half an hour thinking it was charged, only to find it wouldn't start again on the third day – tests revealed an internal short circuit. So never believe the '30-minute drive will revive it' myth, battery health is what truly matters. Batteries last longer in summer than winter, and turning off AC/audio systems after parking saves significant power.
