Panasonic cordless phone owners, this 8-pack of HHR-55AAABU Ni-MH AAA batteries is exactly what you need to keep your phone powered up. These 1.2V 550mAh rechargeable batteries are designed specifically for Panasonic cordless phone systems and are compatible with numerous models including KX-TGF340/350/370/380 series, KX-TGA101/430/930/935 series, KX-TGF575S series, and many more. The nickel-metal hydride technology provides reliable performance with low self-discharge and no memory effect, meaning you can recharge them at any time without reducing their capacity. These batteries can be recharged up to 2000 times, saving you money compared to constantly buying disposable batteries. They're made from safe materials without harmful Hg/Cd/Pb, making them environmentally friendly. For optimal performance, charge them 3-4 times before first use to condition the batteries. The 8-pack gives you plenty of batteries to keep your cordless phone system running smoothly with spares on hand for replacement. Whether your current phone batteries won't hold a charge anymore, you need backups for multiple handsets, or you just want to switch to rechargeable options, these batteries deliver reliable power for clear calls and extended talk time. Keep your cordless phone system operating at peak performance with these quality replacement batteries that are built to last through hundreds of charging cycles.