Rechargeable Li-ion AA batteries

PhotoTime

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Hi,
I am thinking of using Rechargeable Li-ion AA batteries for my wireless mic.

Any recommendation on the brand/model for the batteries, as well as the charger?

Regards.
 

louie

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Eneloop are NiMH, not Li-ion. Most people I know use Eneloops in AA wireless mics, but are just careful to change them out more often than alkaline. Keep several sets handy. NiMH voltage is lower than alkaline and some devices are not happy with that.

There are many chargers work well on Eneloops, check the Reviews section in the forum.

I don't know anything about Li-ion AA cells that have the voltage of normal AA alkaline. You can certainly get Li-ion in AA size, but normally the voltage will be way too high.
 

skid00skid00

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LiIon AA's are known as 14500's. They are 3.7 volts.
"Lithium" AA's are NON-rechargeable, and may have longer life. They are 1.5ish volts. They seem to have longer life in my use.
Eneloop/Amazon Basics NiMH are 1.3ish volts, and are rechargeable. Just buy a dozen, change before each mic use, and recharge after use.
 

Owen

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The ones I've seen, the Pale Blue linked above and the Keeppowers that I use, don't require a charger as they use a micro USB.
I really like the Keeppowers' constant voltage output and method of charging.
They do have a protection circuit that will engage if the battery can't maintain voltage, meaning whatever you're using them in will instantly go dead when the battery is depleted. If your mic has a low battery indicator, that won't work with these batteries.
 

PhotoTime

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Thanks, All,

I just like to highlight that Eneloop is MiMH batteries, and it may not suit wireless mic usage, as they are high power drainer. Therefore, I am looking for Rechargables Li-ion 1.5V batteries. These Li-ion 1.5V batteries are relatively new, so I just like to know what are the more reputable brand.
 

thermal guy

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Eneloop‘s are of course NiMH batteries. I wasn’t paying attention when I posted on them. My bad.
 

Hooked on Fenix

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Thanks, All,

I just like to highlight that Eneloop is MiMH batteries, and it may not suit wireless mic usage, as they are high power drainer. Therefore, I am looking for Rechargables Li-ion 1.5V batteries. These Li-ion 1.5V batteries are relatively new, so I just like to know what are the more reputable brand.
Reputable brands? I'd say Fenix. The highest rated capacity ones I've seen and the most convenient seem to be Epoch brand ones: https://www.18650batterystore.com/collections/aa-batteries/products/epoch-aa-usb-4pack
Charge 4 at a time in 2 hours off of USB and are rated at 2300 mAh or 3450 mWh. These are the highest capacity rated ones I've found. They can be discharged up to 1.5 amp rate. Many brands are only rated around 1600 mAh. However, Eneloop Pro batteries are rated at 2550 mAh. Those are NiMH. Unless you need the convenience of the USB charging, Eneloop Pro batteries will likely outlast your lithium ion AAs per charge. 14500 cells are different. They are 3.7 volts. Unprotected ones may discharge as high as 10 amps, 4 amps for good protected ones. Lithium ion 1.5 volt AAs are different as they have to be protected because they require circuitry to drop the voltage. You will have a hard time finding lithium ion AAs that can beat Eneloops or Eneloop Pros for their discharge rate. I have drained regular eneloops at 4 amps before (lithium disposable AAs are only rated at 3 amps).
 

PhotoTime

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Reputable brands? I'd say Fenix. The highest rated capacity ones I've seen and the most convenient seem to be Epoch brand ones: https://www.18650batterystore.com/collections/aa-batteries/products/epoch-aa-usb-4pack
Charge 4 at a time in 2 hours off of USB and are rated at 2300 mAh or 3450 mWh. These are the highest capacity rated ones I've found. They can be discharged up to 1.5 amp rate. Many brands are only rated around 1600 mAh. However, Eneloop Pro batteries are rated at 2550 mAh. Those are NiMH. Unless you need the convenience of the USB charging, Eneloop Pro batteries will likely outlast your lithium ion AAs per charge. 14500 cells are different. They are 3.7 volts. Unprotected ones may discharge as high as 10 amps, 4 amps for good protected ones. Lithium ion 1.5 volt AAs are different as they have to be protected because they require circuitry to drop the voltage. You will have a hard time finding lithium ion AAs that can beat Eneloops or Eneloop Pros for their discharge rate. I have drained regular eneloops at 4 amps before (lithium disposable AAs are only rated at 3 amps).
Thanks.

Just wondering, do you have an estimation of how long does the Eneloop Pro last in the wireless mic situation, assuming the max distance is <5m, and it has direct line of sight?
 

lightfooted

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Maybe what you need is someone who can throw together a custom battery pack for you that would provide the run time you are looking for.
 

louie

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Wireless battery life will vary depending on the actual product. Do you have a model in mind, and does the manual not list run time estimates? Most manuals list run times for AA alkaline and AA NiMH if they use those, typically using 2k-mAh Eneloops, not Pros. I usually see run times of about 20% less on regular Eneloop vs. alkaline. Pros would probably run close to alkaline, but may not recharge consistently or for as many charge cycles. Discharge current is not a factor with wireless packs.

Personally, I use regular Eneloops in several Shure PGX-D beltpacks and I recall they could go about 6 hours. If you run all day, change them at lunchtime. Eneloops are a known, safe quantity, where Li-Ion quality and performance in AA applications is not, IMO.
 

PhotoTime

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Wireless battery life will vary depending on the actual product. Do you have a model in mind, and does the manual not list run time estimates? Most manuals list run times for AA alkaline and AA NiMH if they use those, typically using 2k-mAh Eneloops, not Pros. I usually see run times of about 20% less on regular Eneloop vs. alkaline. Pros would probably run close to alkaline, but may not recharge consistently or for as many charge cycles. Discharge current is not a factor with wireless packs.

Personally, I use regular Eneloops in several Shure PGX-D beltpacks and I recall they could go about 6 hours. If you run all day, change them at lunchtime. Eneloops are a known, safe quantity, where Li-Ion quality and performance in AA applications is not, IMO.
Thanks for the feedback and suggestion. I am using both Shure beta 58A and SLX1.

Most likely, I will follow what you have suggested; get 2 sets and then change the batteries during lunch time.
 

louie

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If you mean the Beta 58 capsule on an SLX2 body, as well as an SLX1 body pack, the manual says they are both rated for "about 8 hours use with alkaline". So I would expect about 6 hours with fully charged, good standard Eneloop NiMH. I would expect the current draw to be steady regardless of program. Yes, use 2 sets of batteries and change them at lunch; that's standard procedure everywhere.
 
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