Weak battery will not recharge fully. doesn't have enough power to extract a cork.

The internal rechargeable batteries may have failed.
Even when not used, the electrolyte can leak out,
weakening the Ah capacity.
If not still under warranty, see if you can remove the housing and check if cells have a white, crusty residue, which means they have leaked.
If no screws are visible, splitting the two halves of a hand-blender can be a mission - sometimes needing to squeeze one cover-side in a padded vice to release internal hooks.

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If it is new you should look into warranty repair.

Make sure the pitcher lid is assembled properly aligning the arrow on the lid with the arrow on the handle. Press down firmly on the handle until you hear a slight click to ensure it is fully engaged. The Ninja will not run if the lid is not assembled correctly & the handle is not fully engaged.

There are two phillip head screws holding the blender end together where it came apart. They are hidden under plugs on either side of the imprinted information. Simply drill a hole in each plug and remove them by putting something in the hole (small screwdriver) and pulling them out. Loosen the screws, enough to pull the body apart far enough to insert the blender end back in. Tighten the screws back up and your good to go. I left the plugs out, they don,t serve any purpose.

sound like the motor has had it.

Arcing at the brushes is normal although if worn down enough, they can skip since their travel is limited to avoid damaging the copper commutator.Look at the brush guides closely; the simple spring that supplies a little tension to the brushes will 'bottom out' on a slot in the guide once the brushes get too short.

The skipping might be due to the type of speed regulator that is used; an older type was mechanical and didn't regulate well at low speeds.

Subject: Rechargeable Portable Blender Model No. 850-870


I was given one of these blenders for Christmas. I charged it through 3
cycles, used it once and the battery was dead. Charged it through another 5
charge cycles and used it once only to then have another dead battery. I
have put it through at least another 8 charge cycles, and it indicates a
DEAD battery. I have managed to blend two (2) 3/4 full pitchers in total. On
trying to start it now the green light 'flickers' quickly on and shuts down.

This is a totally useless device.

I would like to return it for a full refund, including shipping.

Hi. Go to http://www.kenwood.co.uk/Customer-Service/ and hopefully that will get you headed in the right direction!