Unlimited 10 is supplied with a quick charger (BHZUC18N), which fully charges the battery in around 60-65 minutes. Unlimited 7, on the other hand, uses a standard charger that requires up to 4 hours for a full charge. The difference between the two models lies not only in the charger, but also in the battery technology. Unlimited 10 uses the Bosch Power for ALL 18V battery, which is usually available in 4.0 Ah or 5.0 Ah capacities. This battery is characterised by its optimised cell chemistry, which enables a higher charging speed and longer runtimes. Unlimited 7 also uses Power for ALL 18V batteries, but often in smaller capacities, such as 3.0 Ah, and without a quick-charge function in the standard package. Both models use batteries from the Bosch 18V POWER FOR ALL system, which has been fully compatible with all green Bosch DIY and garden tools since 2007. These include drill drivers, impact hammers and saws. The battery of the Unlimited 10 is therefore also suitable for green Bosch tools and vice versa. BHZUC18N quick charger charges all Power for ALL 18V batteries in approx. 60 min. Power for ALL batteries in various capacities (3.0 Ah, 4.0 Ah, 5.0 Ah) - compatible with Unlimited 6/7/8/9/10 and all green Bosch tools. This allows you to significantly upgrade the Unlimited 7 without having to change the entire hoover.link: Bosch Home & Garden battery pack PBA 18V PowerPlus (1x4,0Ah) (18 V) up to 80 minutes battery life Charger: https://www.galaxus.ch/de/s2/product/bosch-zubehoer-schnellladegeraet-bhzuc18n-staubsauger-zubehoer-12987909.