Hearing Aid Battery Testers with Spare Battery Storage Compartment (Black)

No instructions are needed as everything is noted. Works great too.

Not a problem with it

Important Notice before Purchasing: Now digital hearing aids all have low-voltage protection . Hearing aids began to alarm if the voltage is lower than 1.1V , remind the users to replace the battery in order to achieve best effect . If you take the battery out , the voltage would be rebound . But please note , the rebound voltage is false electricity . If you test the battery on the battery tester , it would show full voltage . But in fact , it is not enough for using hearing aids . We have tested different brands & different types of the batteries , they all have the same point , that is if place the battery in air for a few time, the voltage would be rebound (Open-circuit voltage or false-open voltage). So when the hearing aid is distorted or alarm to replace the battery, the battery needs to be test immediately . And the result is for reference only, the actual feedback from hearing aids shall prevail.

Very convenient gadget, no more guessing if the battery needs changing, just put it in the tester and know whether it needs to be replaced. Perfect size, small enough to fit in a pocket or hang it on your Keychain. Even has storage for an extra battery.

No instructions! For the mechanically challenged here you go. Yesterday I wrote a review after trying and trying to make this tester work. Just before pitching it in the trash I tried pushing the battery against the little metal staple bar below the panel that indicates the charge.THAT'S the trick. The vertical panel becomes dark when there is a full charge and as the batterycharge diminishes so does the darkened area. I hope this lasts as long as my last one.

I did a bunch of tests & didn’t seem to accurate. Unused batteries read at 80% but batteries that died while powering the HA read at 100%

This battery tester has come in so handy. We both have hearing aids and its so easy to check ad see if the batteries are still good.

About ten years ago, I bought a bunch of hearing aid batteries but did not use them for ten years. Recently, I started wearing hearing aids consistently and although the batteries expired over seven years ago, I didn't want to throw them away if they still worked. Using this device, I have been able to use the batteries that still work. I have found that the batteries are either totally dead (around 30% of batteries) or are as good as new. I have used these batteries for the last three months along with a few new batteries and the old ones last just as long.