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Older chargers vs. Newer chargers


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I have a DW890 that I bought years ago.  i came with the standard black charger (DW9116) with the "conditioning button".  I have recently purchased a new dual charger (DC 9320).  My questions are:

1.  Is the old charger as "good" as the new one?

2  Can I leave the batteries in the chargers (old & new) without harming the batteries?

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The DW9116 has been around for a decade, and has seen a few changes. The newer style chargers no longer have the tune up button. Rather they are built in automatically. Once the 30-60 minute charge is complete, the charger automatically goes into tune-up mode. It equalizes all the cells. If you have the newer style chargers with automatic tune-up mode Dewalt claim's you can leave the battery on the charger indefinitely.

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