USA
Catalog   /   Small Appliances   /   Beauty & Hygiene   /   Hair Clippers

Comparison Philips Series 9000 BT9297 vs Philips Series 9000 BT9290

Add to comparison
Philips Series 9000 BT9297
Philips Series 9000 BT9290
Philips Series 9000 BT9297Philips Series 9000 BT9290
Outdated Product
from $83.60 up to $124.88
Outdated Product
TOP sellers
Main
Laser guidance system for contouring
Laser guidance system for contouring
Main functionbeard trimmerbeard trimmer
In box
Nozzles
clipper blade
goatee trimmer
universal comb
clipper blade
goatee trimmer
universal comb /2/
Specs
Haircut length0.4 – 7 mm0.4 – 7 mm
Number of length settings1717
Blade width32 mm32 mm
Blades material/coatingstainless steelstainless steel
Features
self-sharpening blades
wet cleaning
waterproof body
laser pointer
self-sharpening blades
wet cleaning
waterproof body
laser pointer
Power source
Power supplybattery and mainsbattery and mains
Battery typeLi-Ion
Operating time80 min60 min
Charging time1 h1 h
Charge level indicator
Mains 110 / 230 V
 /100-240 V/
 /100-240 V/
General
Additionally included
case
case
Display
Color
Added to E-Catalogmay 2017september 2013

Battery type

Li-Ion. Lithium-ion (Li-Ion) batteries currently dominate the market due to their high energy density, compact size, and light weight. On average, Li-Ion batteries last for approximately 400 charge-discharge cycles. They exhibit minimal self-discharge and lack a prominent "memory effect" (capacity decrease when charging a partially discharged battery). However, these batteries are sensitive to cold temperatures and require precise charging current conditions.

Li-pol. Lithium-polymer (Li-Pol) batteries maintain stable output voltage even during significant discharge. On average, Li-Pol batteries offer a lifespan of around 800 charge-discharge cycles. These batteries don't exhibit the memory effect and remain stable across a broad temperature range, from -20 to +40 degrees Celsius. Their drawbacks primarily involve vulnerability to deep discharge and overcharging. This highlights the necessity for specialized chargers that employ optimal power delivery methods tailored to the lithium polymer context.

Ni-Cd. Nickel-cadmium (Ni-Cd) batteries are engineered to handle substantial charge and discharge rates. They can be stored either charged or discharged without issue. These batteries aren't impacted by heat and maintain their capacity in cold conditions. However, the primary drawback is the "memory effect," which emerges when the battery is prematurel...y charged with residual capacity. Despite being outdated, Ni-Cd batteries are occasionally employed in clippers.

Ni-Mh. Nickel-metal hydride (Ni-MH) batteries excel at managing substantial charge and discharge rates, making them suitable for demanding electric motors and facilitating quick charging. Contemporary Ni-MH batteries offer a prolonged lifespan of up to 1000-1500 charge-discharge cycles, while being environmentally friendly. In comparison to Li-Ion batteries, they appear bulkier and add weight to the device, yet they come at a more affordable cost. This battery type has replaced the previously mentioned nickel-cadmium technology.

— LiCo. Lithium-cobalt (Li-Co) batteries are renowned for their impressive energy storage within a small and lightweight structure. These batteries exhibit minimal self-discharge and lack the "memory effect". They maintain voltage stability almost until complete discharge. However, Li-Co batteries aren't engineered to handle substantial charge and discharge rates.

Operating time

The typical duration of uninterrupted operation for a clipper powered by a self-contained source (battery or rechargeable batteries, refer to Power Source) without requiring a recharge or battery replacement. Extended continuous operation time becomes particularly crucial when intending to use the clipper in locations where recharging or battery changes are unavailable, such as during long trips.
Philips Series 9000 BT9297 often compared