400ex will only start with booster pack
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You can load test it with the battery hooked up. Just make sure connections are ok,battery charged up over night. Fully charged good battery should show between 12.5-12.8 volts. Have the meter leads on the battery while someone cranks it over. See what voltage drop to. If it drops past 9.5 volts,the battery is junk. Look at this good section on batteries.
https://www.batterystuff.com/blog/ho...ry-is-bad.html
https://www.batterystuff.com/blog/ho...ry-is-bad.html
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