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Comparison Philips Series 1000 S1121/41 vs Philips Series 1000 S1211/41

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Philips Series 1000 S1121/41
Philips Series 1000 S1211/41
Philips Series 1000 S1121/41Philips Series 1000 S1211/41
from $57.24 
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Main
Self-sharpening blades. Wet shave and rinse.
Typerotaryrotary
Shavingwet and drywet and dry
Waterproof+IPX7
Specs
Shaving heads / foil3 pcs
3 pcs /PowerCut/
Replacement nozzle modelSH30SH30
Features
movable head / foil
possibility of water rinsing
self-sharpening blades
movable head / foil /4 destinations/
possibility of water rinsing
self-sharpening blades
Power source
Power supplybattery and mainsbattery and mains
Battery typeNi-Mh
Operating time40 min40 min
Charging time8 h8 h
Voltage switchingautomaticautomatic
Color
Added to E-Catalogmay 2023april 2022

Waterproof

Models feature waterproof casing with varying levels of protection, often indicated by two numbers. The first number pertains to dust resistance and is often marked as X. The second number reflects moisture resistance, particularly water. For instance, IPX3 and IPX4 offer splash protection, IPX5 and IPX6 enable shower use, while electric shavers with IPX7 can be submerged underwater for up to 30 minutes.

Battery type

— Li-Ion. Currently, the prevailing battery type is Lithium-ion (Li-Ion), known for its high energy density, compact size, and light weight. Li-Ion batteries offer approximately 400 charge-discharge cycles on average. These batteries exhibit minimal self-discharge and lack a significant "memory effect" (capacity reduction due to charging a partially drained battery). However, they are sensitive to cold temperatures and require high-quality charging currents.

— Li-pol. Lithium-polymer (Li-Pol) batteries maintain stable output voltage even during significant discharge. These batteries offer an average lifespan of about 800 charge-discharge cycles. Unlike some battery types, Li-Pol batteries don't exhibit a memory effect, and they operate reliably within a wide temperature range of -20 to +40°C. However, they are sensitive to deep discharge and overcharging. To address this, specialized chargers employing suitable power supply algorithms for the lithium polymer context are recommended for maintenance.

— Ni-Mh. Nickel-metal hydride (Ni-MH) batteries excel in managing substantial charge and discharge currents, making them suitable for power-demanding electric motors and rapid charging. These batteries now boast impressive longevity, enduring around 1000 to 1500 charge-discharge cycles, while maintaining an eco-friendly nature. In comparison to Li-Ion, Ni-MH batteries appear bulkier and add weight to the device, yet they offer a more economical option.
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