What rechargeable hearing aids last the longest? I am outdoorsy and not always near an outlet.

For daily battery life, most last 20-30 hours, but this can be reduced by how much Bluetooth streaming you do. Consider it a 1:2 ratio, where 1 hour of streaming equals two hours of battery life.

Most of the manufacturers are now including a battery pack with the charger, which is good for 5-7 days battery life in case you go camping or have a power outage.

And yes, the battery pack is also rechargeable.

Another consideration is the overall lifespan of the battery. Z-power batteries should be completely replaced every six months and can be replaced by your local provider. Lithium ion batteries last 4-6 years, but have to sent to the factory for replacement. In addition, if the hearing aid is out of warranty, replacing a lithium ion is considered a repair, and can be quite expensive($200+ each!). So right before your warranty expires, have the aids sent in to the factory to get the batteries replaced. This way, because of the replacement, you’ll get 8-10 years out of the. Instead of just 4-6.  

The battery life on a hearing aid can vary depending on how it's programmed, whether it has been paired to a mobile phone, how much time you are streaming a live audio signal from a phone, etc. Fortunately, all of the rechargeable solutions I'm aware of, including those mentioned, use a charger that runs on 5 volts DC using standard USB connectors. So if you can carry a small portable power pack (can be a cheap generic one), and the HA charger with you, then you could charge them while camping or backpacking, for example. Having said that, some of the chargers are definitely bulkier than others. The Oticon charger is probably the bulkiest, the Signia charger is probably the least bulky.

I also agree with the previous poster recommending Z-power. Although Z-power has had its issues, it really excels in its flexibility. You can charge it most of the time, but when you travel or go on a camping trip, you can leave the charger at home, and just bring a few disposable 312 batteries to use until you get back.

The Phonak Marvel hearing aids will go for a good 36 hours without needing to be recharged. If you are planning on being away for a long time (maybe a week or more) then I would go with something like the Starkey Livio AI which has 2 power packs that can hold 7-10 full charges without needing an outlet. 

Resound Quattro has 30 hours and the charger has 3 extra charges in it and doesn't cost extra/is not an add on. It's just the regular hearing aid case.

Any of the lithium ion instruments last 16-24 hours on a charge but also several come with a charging box that will let you charge them up on the go without needing to plug in. You can charge them for 4 days without having to plug them into the wall or car. You can also get you a small portable charging stick that will re-power up the box and hearing aids at any best buy.

If you sweat a lot, a rechargeable hearing aid like the Marvel from Phonak would be great, since there is no battery door and it is more moisture proof.  You can get a power pack for the charger that would provide 10 charges- i.e 10 days of battery.  One charge would last you roughly 24 hours of use.  Hope this helps.

If you are often without an outlet I would recommend not using a rechargeable hearing aid.  It is so much easier to carry a package of batteries in your pocket.  Also, one less thing to go wrong with your hearing aids as you don't have to worry about the charger not working!  Keep it simple.

The Styletto by Signia has a charger that will hold up to three charges without being plugged into an outlet.  The life of each charge varies with how much Bluetooth streaming is used, but will usually last 20-24 hours.

I would recommend the phonak marvel. They have additional add ons to the bottom of the charger that you can charge up ahead of time.  Extra power packs, plus one charge lasts more than 1 day which is a little longer than most of the others.

I would recommend the Widex Evoke RIC D with Z-power rechargeability, or any z-power rechargeable hearing aid if you want rechargeable but then "in case of emergency" you would like to use a regular battery you can. Otherwise with the lithium ion option you need to make sure you have extra power packs handy in case you don't have an outlet. -Dr. Elly Pourasef