Review on Long-Lasting EBL 9V Lithium Rechargeable Batteries With USB 5400MWh Capacity (Pack Of 2) by Mark Repp

These so far have lasted longer than your standard battery pretty charge and charge very fast. Each set comes with a charger cable that charges 4 batteries each.Potential savings if batteries hold up as long as claimed is in the thousands per set of batteries.They currently only have 4 packs which is really only enough for 1 maybe 2 devices. Larger packs with incremental price breaks would be great.I did get 1 battery that the head was soldered slightly offset so it doesn't fit into really tight battery compartments. Sometimes rotating it will let it fall in. Very small inconvenience and does not appear to be a common quality issue but my sample is small. I don't have many devices that have a small battery compartment either.PROS:1) Long life per charge2) Easy indicator light for charge status (only while charging)3) Standard micro USB port to charge in case the provided charger is lost or damaged.4) The provided charger cable is actually a dongle to charge up to 4 batteries at once with 1 charger block.5) Potential to save thousands over the life of each set of batteries compared to non rechargeable batteries.6) No specialty charging unit like traditional rechargeable batteries7) The provided cases are great for storage between users and charges.CONS:1) Very high price per battery2) No purchase options above 4 batteries at this time.3) Each order comes with a charger dongle (I have 16 batteries from 5 orders and 5 dongles)4) The stress of worrying that someone will toss them and replace with standard batteries not realizing they are rechargeable.