FeaturesMore power for the Nuki Smart Lock thanks to the rechargeable battery packUp to 100 percent longer battery life compared to alkaline batteriesCan be easily retrofittedCompatible with all Nuki Smart LocksCan be recharged via USB-C – even while in operationWe’ve got a true powerhouse in store for your Smart Lock – the Nuki Home Solutions GmbH Power Pack. Experience up to 100 per cent longer lifespan compared to conventional batteries. The rechargeable battery pack guarantees up to 6 months of uninterrupted power supply. The free Nuki app shows the current battery charge level and automatically notifies you as soon as it falls below 20 per cent. With the supplied USB-C cable, the Nuki Power Pack can even be charged while in operation. This means you can keep your Nuki Smart Lock permanently connected to the power supply.