Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

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Battery: Service and Repair


Caution: Boost charging (with a high current or voltage above 16 V) will damage the battery and is prohibited.





When testing components it is important that battery voltage is normal (approx.. 12 V). If necessary, a battery charger can be connected during testing.

Connect battery charger to the battery terminals. Charge battery for approx.. 10 hours at the recommended current - maximum 6 A.

Example: If the battery is marked 520 A a charge current of 0.01 x 520=5.2 A is recommended.

A higher than recommended charge current can damage the battery.