Paleblue 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

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.

Amazing rechargeable batteries. Easy to tell if they are charging or charged fully. They seem to last 2x longer than my other batteries.

The charge last longer than i was expecting

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.

I bought these to use in a TENS machine (electrical muscle stimulator for stiff muscles). Ordinary 9v batteries only last for a couple of sessions, but these can be recharged and reused. The cost for each is roughly double the cost of an ordinary 9v battery, so after about two recharges you are money ahead, plus you produce less electronic waste. I also have these in AA and AAA sizes. Love them all.

have used both of the batteries through several charge and use cycles and both work perfectly fine. They hold their charges very well and recharge faster than expected. I like the built in red/green LED indicator that tells you when the batteries are fully charged.

We've been phasing out all the disposable batteries in our device lab we have, and no one has complained about them. I've even put these in my fire/smoke detectors at home and I've not had to replace/recharge them in a couple years. Kinda pricey compared to other brands in the same market, but they are worth it.

High quality batteries. Glad I sprung for PBE.