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Customer Review

278 of 314 people found the following review helpful
3.0 out of 5 stars Uses disposable AAs, February 17, 2010
Verified Purchase(What's this?)
This review is from: Panasonic Dental Water Flosser, 2 Speed/Pressure Settings (Health and Beauty)
I bought this intending to use rechargeable AAs with it, but the instruction booklet says not to because of possible corrosion. This was a disappointment for me and I may try rechargeables anyway.

Low speed is a nice option for dispensing ACT or other mouthwash to the gum line, but the reservoir is so small that you must work very quickly - note the instructions suggest to use only water and to always empty the unit after use). The on/off switch is extremely stiff though. Note that on high speed it is much less powerful than a standard Waterpick but still effective. This might be a good thing if you're concerned about damage from the higher pressure Waterpick. Pulsing water pressure can dislodge restorations, mind you!
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(Reporting back in 2013) I used rechargeables now for some time in this without issue other than their very tight fit. They should work just fine for you too if you can make them fit. Respect the earth.

The soft battery cover can easily be damaged by the wrong tool to open it (a quarter did this in my case). I found though that a 5-cent nickle does the job nicely without damage. I keep one with the unit ready for battery changes.

Because of the tiny reservoir though, I find I just don't use it (I can't get through my whole mouth without refilling it).
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Showing 1-10 of 26 posts in this discussion
Initial post: Jul 9, 2010 11:20:48 PM PDT
Last edited by the author on Jul 9, 2010 11:24:03 PM PDT
R. P. says:
I ignored the instructions about not using rechargeable batteries.... rechargeables DO work, but to my dismay, the device eventually stopped working. When I looked inside there was visible corrosion on the batteries. This is possibly because I use it in the shower. Even when I put in alkaline batteries the thing still would not work, so I had to throw it away. I'd follow the instructions if I were you. Buy a bulk pack of alkaline AA's on Amazon or something. Cheap alkaline batteries don't last as long as duracell or energizer, but they are a better value.

In reply to an earlier post on Feb 14, 2012 10:28:58 PM PST
Last edited by the author on Feb 14, 2012 10:30:52 PM PST
jackstraw says:
if it takes throw-aways it will take rechargeables, regardless what the manual says. there is no excuse from an environmental or money saving point of view for any electronic item to require throw-away batteries. if necessary you could put a thin bead of silicon seal under the battery door. even if it corrodes your will do better for the environment and your pocketbook by throwing away the panasonic and getting a new one (as long as it does not happen more than twice a year). throw-away batteries are bad news.

In reply to an earlier post on Apr 7, 2012 6:08:08 PM PDT
D. Jordan says:
I tried rechargables and it is all corrroded and needs to be replaced. Theyare right.

Posted on Jun 13, 2012 2:27:54 PM PDT
K. Coates says:
I bought the previous version, which is probably identical to the current version in this regard. I've used rechargeable batteries on this unit for well over five years with no problems. It works great, and I love it. Even with my very hard water, it looks like it will live for many more years.

In reply to an earlier post on Jun 20, 2012 11:04:31 AM PDT
R. Wang says:
Did you ever take it into the shower or just keep it on the basin top?

In reply to an earlier post on Aug 24, 2012 8:59:10 PM PDT
Last edited by the author on Aug 24, 2012 9:01:55 PM PDT
Deep says:
Many rechargable batteries provide 1.2v versus 1.5v by Alkaline. I am not suggesting this is the reason, but for some devices that may be the reason

In reply to an earlier post on Aug 24, 2012 9:11:59 PM PDT
Bernardo says:
You cannot always use rechargeable batteries in place of throw-away batteries because the voltage of rechargeables is lower. A rechargeable battery will look like a discharged throw-away battery to the electronics.
Bernd Riechelmann

Posted on Sep 24, 2012 2:34:06 PM PDT
Crimech says:
What brand of rechargeable batteries were you using ? I've been using Sanyo eneloop on shaving , nose , trimmer , portable speakers, flashlights and other dental irrigator devices and never had this leakage problem. If you can provide with a specific brand and model so I could do a research on their chemical composition.

In reply to an earlier post on Sep 24, 2012 2:35:11 PM PDT
Crimech says:
Please, can you tell me what brand and model of rechargeable batteries did you use ?

Posted on Oct 23, 2012 7:46:38 AM PDT
Last edited by the author on Oct 23, 2012 8:07:25 AM PDT
Re the rechargeable batteries.

This is not to be taken too seriously. For one, Panasonic sell A LOT of Alkalines, at a VERY high profit margin (production cost less than a penny; in the US they sell typically for 60 cents, and often even at one dollar. That may be one "motive" coming from Panasonic's Marketing Dept. (?).

But more importantly: NiMH have both more power and LONGER life than alkalines in THIS application. Forget the 1.2V vs. 1.5V issue; if the internal resistance of the 1.5V Alkaline cell is too high (which it typically is), it simply will not deliver the power needed for the motor.

That is why digital camera manufacturers tell you to use NiMH instead of Alkalines. Cameras just like this "irrigator" use a LOT of electrical juice. (In my inexpensive CANON camera NiMH last 50 to 80% longer than the Alkalines.)

The corrosion issue is best resolved by buying a quality NiMH name-brand. Example only, SANYO.
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