Modern batteries are now high-capacity, but their battery lifespan also owes to proper usage. Lithium-ion batteries have replaced other battery types in many areas.
Contents
- Tips for Proper Charging of Lithium-Ion Batteries
- How Do I Find the Right Charger?
- What Is the Memory Effect?
- Bluetooth Devices with Battery and IPX Protection Class
- Properly Charging the ROCKSTER AIR
Tips for Proper Charging of Lithium-Ion Batteries
- Avoid complete discharge (deep discharge), as it severely damages lithium-ion batteries.
- Ideally keep the battery level in a mid-range (about 20–80%) to extend its lifespan.
- Aim for as consistent charging cycles as possible and avoid extreme charge states (optimal operation is in the mid-charge range).
- Do not charge your device to 100% for extended periods and do not leave it unnecessarily plugged in (e.g., overnight).
- For long-term storage of the device, a battery level of about 40–60% is optimal. A fully discharged or over 90% charged battery is unfavorable.
- Protect batteries from extreme temperatures – especially heat or charging below 0°C. Also avoid moisture, high humidity, and strong shocks (e.g., from a fall).
How Do I Find the Right Charger?
Teufel uses USB or USB-C as the charging port on almost all mobile speakers and headphones. Teufel deliberately relies on standardized chargers so you can continue to use existing power adapters.
We sell our own USB-C power adapters via the webshop. These are intended for all Teufel devices with USB-C. However, you can also use almost any USB or USB-C charger. Information about USB / USB-C chargers can be found here. Information about the availability of other power supplies can be found under Spare Parts and Accessories.
To find the right charger for your Teufel device, proceed as follows:
1. Check which charging port your Teufel product has
Look at your product. Most current models charge via USB-C. If you bought your device before the switch to USB-C or it is somewhat larger (e.g., ROCKSTER AIR 2, ROCKSTER 2, etc.), it may also have a Micro-USB or another port (e.g., for an AC power supply). The user manual can also help you here.
2. Find out how much power the charger should have at minimum
How much power your device requires can be found on the respective product page (in the icon near the "Add to Cart" button) or in the user manual.
What Is the Memory Effect?
The so-called memory effect describes a capacity loss that mainly occurs with older nickel-cadmium batteries (NiCd). With repeated partial discharges, the battery "remembers" the level of discharge used and later only delivers this lower amount of energy. This manifests as an early voltage drop, causing devices to detect the battery as "empty" earlier – even though energy is still available.
What causes the memory effect?
The scientifically confirmed causes are chemical changes inside the battery:
- Crystal formation: During charging, cadmium microcrystals form, which grow into larger crystals with frequently consistent shallow discharges. These impair the electrodes' reactivity and lead to early voltage drop.
- Recrystallization due to overcharging: Older chargers that do not monitor the charge level sometimes overcharge partially discharged batteries. This changes the cadmium structures, further reducing capacity.
Important:
The memory effect does not occur because you "charge too early" or plug in the cable at half battery level. Modern chargers reliably prevent overcharging.
Which batteries are affected?
- NiCd batteries: heavily affected – classic memory effect
- NiMH batteries: only slightly affected
- Lithium-ion batteries: practically not affected, as their chemistry does not produce corresponding crystal formation
How can the memory effect be reduced?
For NiCd batteries, the effect can be mitigated by a so-called refresh:
Repeated complete discharge down to the permissible minimum voltage and subsequent full charging can reduce crystal structures and partially regain usable capacity.
For modern lithium-ion batteries, however, this method is unsuitable and even harmful.
Bluetooth Devices with Battery and IPX Protection Class
If you want to use your Bluetooth devices in damp or wet areas, make sure that the speaker or headphones have the corresponding IPX protection class. The respective IPX protection class indicates whether you can use your device in the sauna, while jogging, in the rain, or underwater. For example, our Teufel ROCKSTER GO, ROCKSTER CROSS, MOTIV® GO, BOOMSTER GO, BOOMSTER, and many of our Teufel headphones are IPX-rated.
Properly Charging the ROCKSTER AIR
The battery is only pre-charged in the delivery state. Before first use, you must fully charge the battery. The internal battery charges as soon as the ROCKSTER AIR is connected to the power supply and switched on.
If no audio signal is present for 20 minutes, the ROCKSTER AIR switches to standby mode. To prevent the charging process from being interrupted here, please set the rear switch to "permanent on".
During charging, the "BATTERY STATUS" LEDs show the charge level with a running light.
Charging time: A complete charging cycle of the internal battery takes about 7 hours. After charging, the integrated charger switches to maintenance charging and keeps the battery fully charged for several weeks.
See also: ROCKSTER / ROCKSTER AIR: The battery does not charge and/or discharges very quickly. Reset can help