Siemens 'pure', charger

Hello. If anyone has information on the charger for the pure aids, please advise me about how long the batteries will hold the charge.
If I have a long day, perhaps 16 hours, my aids close down. Anyone know if this is a common problem?

Carry some extra 312 batteries. Those aids can use the rechargable or the standard.

I am using the rexton cobalt 16s which has the same charger setup. Mine lasted around 18 hours only when I 'ran them right down. I was surprised by how short a time that was. I am sure it could vary with the quality/brand of rechargeables you have.

Pure 700s then 701’s with the charger; use about 14-16 hours daily. No problems so far, I likewise carry some 312s for backup.

The brand name of the rechargable batteries is “power one” ACCU plus
nickel-metal-hydride, (p312accu) A division of VARTA. Supposed to last at least 1 year.

Verify the instruments are sitting all the way to the bottom of the charging receptacle to ensure a matched connection when charging.

The lights on my charger quit blinking when the instruments are charged. One time I did not get one of them seated properly. The light for that side was still blinking while the other side that was seated properly had a solid light and a full charge in the morning.

Thanks everyone. Seems that 16 hours or so is the average for holding a charge. Pity.

I must admit that I am a hopeless gadget junky. When I purchased my 700’s I just had to have the charger. I only got 14 hours plus or minus on a charge. My audi kept insisting that something was wrong and kept swapping out my charger and batteries. No change. Finally she contacted Siemens and they only claim to something like 12 hours.

Needless to say I use disposable batteries and find it more convenient to just change them once a week, (every Saturday morning).

I get free batteries for 3 years from my audi anyway.

I used the charger for about a year and found that the batteries would quit sooner and sooner, and that if I had to go past 8 or 9 in the evening with guests, the batteries would chime ‘time to recharge.’ I even programmed a power bar not to start charging them until 1 am as I always get up at 6. They take 5 hours to charge. It was such a pain that I just buy the throw-aways now and get almost two weeks out of a pair.
In any case, always open the HAs when you’re not wearing them, the batteries last longer.


My batteries-the first year- were good for abt 11 hours on a charge and worked fine. Now my charger starts the green blinking for about 3-4hours then goes to solid red and stays there. Never goes to solid green. If I pull the plug and reinsert the plug it will blinks green again for about an hour and then goes red again. The batteries run the next day for about 6-7 hrs until I get the signal. Anyone know why the charger goes red after about 3 hrs. Bad charger? Bad batteries?

My guess would be that the batteries have reached the end of their life. They are only good for so many charges. If yours are over a year old I would ask the audiologist what the life of the batteries is.

Mine are only 2 months old but I wear mine for 16-18 hours a day and have never run them down. I don’t have a bluetooth device yet so communicating with that may shorten the cycle.

I’ve been seeing a useful life of about a year with the SIEMENS 312 (Power One) rechargeables before they start dying earlier in the day. If you’re experiencing this problem have your specialist inquire with SIEMENS about replacing the batteries. If it’s been less than a year they (SIEMENS) might replace the batteries for you at no charge (they’ve done it for one of my patients).

Thanks for the great feedback – I was on the fence about getting a Siemens rechargeable unit (quoted as $45 through HearPO) and figured it was a no-brainer for the price. But it sounds like I would not be happy with the performance at any price

For what it’s worth, I will add that I believe rechargeable batteries don’t handle heat well. Body temperature is just fine, but don’t leave them in the car on a hot day.

I’m about to order my first set (leaning toward Siemens Motion 701 or Phonak Ambra) – are the hearing aids themselves also sensitive to heat?

Does anyone know if this charger dehumidifies if the HA’s are inserted without any batteries? Or does it only dehumidify if charging? I’ve got this charger but not quite sure how it dehumidifies? Heat from the unit / charging?


It will dehumidify even if it is not “charging”. It uses heat and some versions of it have dessicant beads inside…

dr. amy

Thanks Dr. Amy! :slight_smile:

Not sure why you would not be happy. I don’t ever want to go back to non-rechargeable. Rechargeable is the way to go. Previously my batteries would go out at the wrong time, always. These never go out. If they only last a year that will be fine with me, I will replace them.

Siemens, unlike most other HA companies is a global corporate behemoth. Siemens admitted guilt in global bribery charges brought against them by the U.S. Dept. of Justice and the German government. The $1.6 billion in fines were part of the largest bribery case in history. If you have a choice between hearing aid companies, this is some information that you can consider.

The old rechargeable aids had a drain of less than .6 mA and with NiCad cells would have a pretty good life between charges. The newer digital circuits will have a drain of about 1.2 mA. With a 312 cell size capacity of about 22 mA, it should last about 18 hours or so. That is, If the cell has not gone through too many charge cycles and if your aid has an average drain not over 1.2 mA and if the battery capacity figures put out by the cell manufacturers are not overly optimistic.

With the trend of aids having wireless capabilities and another probable hike in the power overhead of hearing aids, my guess is that rechargeable aids might not be practical until they are able to use a higher capacity battery - either by using a physically larger cell or through improved cell chemistry.

Two Siemens employees were convicted of running a bribery scheme directed at Nigerian and Russian interests and were punished. Siemens has thousands of employees and two were bad. Please don’t disparage the thousands of good Siemens employees because of the actions of two. Would you want your reputation to be determined by a couple of bad people in your company?

It was not part of the hearing aid business anyway.

I did not “disparage” anyone. And your contentions are inaccurate about the biggest bribery case in history. 11 execs were indicted including two former CHIEF executives for bribery in a dozen countries including the food for oil program under Saddam Hussein.

Don, do you not want people to have information about companies that they spend thousands of dollars with? Heck, I want to know the record of the company who makes my cell phone (most use conflict minerals from the Congo). I like to be an informed customer but I am not urging anyone to buy or not buy from Siemens.

i am guessing the moderator will be ending this subthread, so I won’t be posting on this subject again.

Lalo, My impression from your post was that you were attempting to tie hearing aid purchase decisions today to what two mid-level managers did in a section of a large company, 2002-2006. My point is that it is important to separate the mistakes of a few employees from the overall corporation and their products. In the article I read the American side of the investigation used a law firm and a member of the law firm had this to say about Siemens:

“Siemens officials “made it crystal clear that they wanted us to get to the bottom of this and follow it wherever the evidence led,” said Bruce E. Yannett, a Debevoise partner”.

And, “At the same time, Siemens worked hard to purge the company of some senior managers and to reform company policies.”

The case broke in 2006 and the article I read was written in 2009 so it is somewhat old news and not relevant as since then Siemens has cleaned things up (which you failed to mention).

I would be more concerned about Siemens shopping the hearing aid division around. Had it sold that might have really affected my use of a Siemens hearing aid (parts, repairs, etc.) but a sale didn’t happen and it looks like now it will keep its hearing aid division.

I know everyone here is concerned about the plight of oppressed people and the stories of conflict mineral production in eastern Congo are heartbreaking. But, there may be a situation of unintended consequences if everyone were to stop buying cell phones and other electronics. I don’t know what the answer is but I don’t think lowering the demand for the minerals (and therefore the income of the people we want to help) is the answer.