Works perfectly. Apparently when the batteries die, there I some kind of sensor in the battery pack that prevents charging. This new Ninja battery fits perfectly and charges immediately. It was at about 70% charge when I first installed it. I used it for an hour after charging to 100% and it still has over 2 hours remaining.Thank Ninja too for their link to professional tips for Lithium batteries. It is important to know that you should never let them go below 20% charge! Thanks Ninja!Also, delivery was very fast. Expected delivery was almost one month, I received the battery in 4 days!
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