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That's peak voltage, and will drop off VERY quick when run.  You're sitting at 1.445v & 1.5v/cell, which is high, but not abnormal for a higher capacity NiMh sub-C pack.

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On race weekends, I would charge my batteries at 5 amps and they would finish around 9.1 volts. I'd try to get the battery to peak as close to race time so the battery would stay that high at the start of the race.

You're totally fine.

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On my charger, That is the charging voltage, not the voltage of the battery.  I just did a charge, and the voltage displayed on the charger was ~0.8 Volts higher than the voltage read from the battery with a volt meter immediately after.  Check yours with a voltmeter to see where they really ended up.

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On 9/29/2023 at 5:53 PM, Tbird232ci said:

On race weekends, I would charge my batteries at 5 amps and they would finish around 9.1 volts. I'd try to get the battery to peak as close to race time so the battery would stay that high at the start of the race.

You're totally fine.

With the battery still roasting hot, as you're fixing it into the car!

Surprised we didn't blow them up more often tbh! (Had one pack blow, and one split)

Oh the good old days.😄

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Nimh and nicad chargers will continue to charge until they see a voltage drop which signals that the battery can take no more capacity. With nimh being set more sensitive than nicad chargers. You may notice the charger slows down near the max voltage as it notices a voltage drop it drops off the current until it pack reaches the pre determined allowable voltage drop at all current settings.  The max voltage is generally around 1.5v per cell. What you saw is fairly normal, you should see up to 9v from a 6 cell pack charging, although it’s sometimes lower with ageing batterys

lipo’s are different where we need to fix the charging end point at 4.2v per cell to prevent damage. Unless they are HV cells in which case it’s 4.3v per cell.

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