- USB Rechargeable 9V Batteries (2-Pack) - 4500mWh Lithium Ion, 1000+ Charge Cycles, Includes 2-in-1 USB-A to USB-C Charging Cable, LED Charge Indicator, 3.4 Hour Charge Time

These are great batteries. They work well in a Fluke multimeter. I got tired of buying and throwing away expensive 9V batteries - these batteries solved that problem. I would not recommend this type of battery for a smoke alarm or CO2 alarm, but for other applications they are great. The voltage does not reduce slowly like a non-rechargeable battery, they just go from 9V to 0V so the low battery function in the smoke alarm will not work with this battery. This poses a safety concern because you might not know the battery has discharged. It is an annoyance in normal devices because you will not get a low battery warning before it stops working, but in a safety critical application like a smoke alarm it could be deadly.

Pale Blue's Rechargeable 9V Smart Batteries offer a convenient and eco-friendly alternative to disposable 9V batteries. Here's a close look at their features and potential drawbacks: Pros: Cost-Effective: While the upfront cost is higher than disposable batteries, these Pale Blue rechargeables can replace over 1000 single-use batteries, leading to significant savings in the long run. Fast Charging: The batteries can be fully charged in under 3 hours, making them ideal for replacing depleted batteries quickly. High Capacity: With a 500 mAh capacity, these batteries should provide ample power for most 9V devices. Long Lifespan: Pale Blue advertises over 1000 recharge cycles per battery, significantly reducing waste compared to disposable batteries. User-Friendly: The included USB-C charging cable makes charging convenient, and the LED indicator clearly shows the charging status. Cons: Higher Initial Cost: As with most rechargeable batteries, the initial purchase price is higher than disposable batteries. Limited Availability: While these batteries seem to be gaining traction, they might not be as widely available as traditional disposable batteries. Compatibility: Double-check that your devices are compatible with rechargeable 9V batteries before purchasing, as some electronics may not function properly with them. Overall: Pale Blue's Rechargeable 9V Smart Batteries are a great option for environmentally conscious consumers who want to save money in the long run. The fast charging, high capacity, and long lifespan make them a compelling alternative to disposable batteries. However, the initial cost and potential compatibility issues are factors to consider before buying. If you frequently use 9V batteries and your devices are compatible, these rechargeable batteries from Pale Blue are a sustainable and cost-effective choice.

I haven't battle tested the capacity, but I can say this and the AAA from paleblue deliver the same voltage as promised on the label and are comparable to non-rechargeable batteries. Other rechargeable brands will either fail to deliver on the promise or at least be honest in their labeling that it's less voltage than standard. Voltage does not degrade over time, so I wouldn't use it for something life and death like a smoke alarm, but for anything else, these seem to work great.

I wanted to take my guitar amp replacing, but relatively high power consumption, Boss IR-2 to a gig with nothing else. This battery can be installed inside the pedal and delivers the required power for a 3 set gig with margin. It delivers the 500 milliamp-hours at 9 volts it advertises (4.5 watt-hours) when I tested it. At least one other brand did not come close to its power specs. BTW an alkaline 9 volt battery is also about 4.5 watt-hours. [edit 1] Now I am having a problem getting the battery to start up. [edit 2] After some experimenting I’ve determined the USB C charging connection only works with most USB C cables and power adapters. USB A to C (or Micro USB) is bulletproof. I think the battery’s internal switching converter (3.6 volt lithium ion to 9 volt) is hanging in the off state when left inside the pedal. Two different stomp boxes exhibited the same problem. The battery isn’t discharged and connecting it to a USB charger resets the battery to an operating state. I am now trying Command Strip mounting the battery to the pedal and cabling it to the pedal external 9 volt input only when using the pedal. For recharging this also is convenient. I’ll report back when I determine this works. I have a Tonex One on back order and for it the external approach is the only option anyway. [edit 3] Working perfectly as photographed.

Doesn't requrie a separate charging device, any usb C cable will work, though it comes with a cable. Happy with the Paleblue lineup of batteries.

GREAT STUFF

Really worth what you pay for, long lasting charge. Excellent for medical devices.

Worked for 6 months on my fishman pickup After fully charged, this battery gave me distortion during the live session. Also Type C charging port stopped working after few charges while microUSB was working. Not so reliable

Love how eco-friendly these are; arrived nearly 100% charged. Work fine.

Brilliant piece of kit, love the carrying case as well