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The W-5 battery is used in the AC770S hotspot. If it is fully discharged (stored for a long time), it may not be recoverable. In some cases it may be possible to boost charge the unit. I used a computer controlled 9 volt Energizer charger to do this while watching the voltage. If you can get it up to near 3 volts in less than a minute, you can put it back in the AC770S, and let that take over charging. Fully recharged in about 2 hours. (Using a fan to avoid heat build up.) This is one of those "don't try this at home" adventures. I do like the AC770S. Finding a useable battery is getting hard to do. This unit (well, the second one) actually works!
Verified purchase: Yes | Condition: New
With batteries you just never know what you're 'gonna get! This battery works just like it did when the Wi-Fi was new. A good value so far. Ask me in one year about longevity.
Verified purchase: Yes | Condition: New
My Sprint Mobile hotspot stopped charging and Sprint couldn't help since they discontinued this less than a year old model so I ordered this and saved a bunch!
Verified purchase: Yes | Condition: New
I ordered this as a replacement for the one that came with the device (an AT&T wifi hotspot). The original battery in this device started to warp and deform. This wifi is plug in most of the time and the wifi is actually turned off. We only use it when we travel and we have not done much lately. Anyway, we hope that this battery last also about 2 years and we are good. Then I'll buy another or upgrade the device. Thank you.
Verified purchase: Yes | Condition: New
I saved tons, battery is great quality and lasts. I recommend.
Verified purchase: Yes | Condition: New
