Exmate4V 2.5Ah Replacement Battery Compatible with Ryobi TEK4 AP4001 Lithium-Ion Rechargeable Battery

I have a ryobi tek4 noise canceling ear muffs and its battery finally gave out! It was nice to find they still make the battery, even if they don’t make the ear muffs anymore! It is nice to protect my hearing yet still be able to talk and hear conversation in a noisy environment!

These are just as good as original Ryobi batteries except better, because they are higher amperage.They will spend the driver a little faster and have better torque.

The media could not be loaded. Set it to charge - the charger didn't even recognize it at first. Then it turned on briefly - but it didn't hold a charge.Dead, even after a full charging period. Even tried the "discharge and recharge three times" method listed in their instructions (in tiny print) --- nothing. Dead.So I contacted customer service, because the ratings were pretty good - I'm sure it's a minor thing.And Customer Service - Zero Help. First, they want you to take a video of charging, and attempting to use it. Then the video will get rejected multiple times, unless it's less than 6 megs. Then they'll tell you they won't be able to open it, so please send it to their hotmail account. They won't tell you what the hotmail account is --- but with a little searching, you can find their main website by googling Exmate, and their corporate email is a Hotmail account, so I sent it there. That was Tuesday morning.Come Saturday night, still nothing. Nada.But thankfully, Amazon Assistant at least understands (and it's a program) customer service - and refunded the dead battery.Go with OEM, the savings isn't worth the hassle.

Well, I needed a second battery and I found this 2.5 Ah and man does it out perform my stock RYOBI 1.3 Ah.Price is important to me and RYOBI has higher TEK4 Ah repacement batteries, but wow was the price high!Low Priced / Higher Ah, how can you loose?

Works like a charm and costs less than the Ryobi brand. No issues at all with charging or operating in the tool. Solid construction and excellent overall quality

Ran for a few days of use. Died suddenly. Will not recharge.

Battery arrived quick and after charging it worked fine. Seems to be as advertized as far as power. Would buy again if needed

again this batterylasted 1/2 of the time my last batteries lasted. all of the above star ratings are a big fat "0" this is my second purchase of from amazon. this makes two purchases of pure crap! this battery lasted 1 charge and discharge and now it won't take a charge or run my screw driver.