What Size Wrench is Used for Car Battery Screws?
2 Answers
Generally, the commonly used wrenches for removing car batteries are sizes 10, 12, 13, and 14. Here are some precautions for using car batteries: 1. Forgetting to turn off the air conditioner after turning off the engine: Many car owners have this habit of not turning off the air conditioner after shutting down the engine, allowing it to start again when the car is restarted. However, this method can cause an instantaneous power surge in the vehicle, and over time, it can also wear out the battery. 2. Frequently starting the vehicle in a short period of time: Especially in winter, when the car is difficult to start, if the first attempt fails, do not rush to repeatedly restart. The interval between each start should be kept at least 3 seconds, otherwise, it can lead to excessive battery discharge and damage.
I've worked in auto repair shops for over a decade, and most battery wrench sizes I've encountered range from 10mm to 13mm. Japanese cars often use 10mm, while European/American models may require 13mm. Safe operation is critical: always turn off the engine first and disconnect the negative terminal to prevent short circuits; avoid excessive force when tightening screws to prevent stripping or slippage. Personally, I recommend keeping a socket wrench set - adjustable wrenches work but are less precise. Sizes vary by model, so the most reliable approach is checking the vehicle manual or looking up specifications online rather than guessing. Keep a caliper to measure bolt head width - sizes below 10mm are rare but problematic when encountered. Loose batteries cause excessive vibration - address this early to prevent electrical issues. Wear gloves during battery replacement to protect against acid burns.
