Comparativa de baterías – Con todo lujo de detalles

Gracias a la información aportada por uno de los lectores de Vaportunidades.com hoy os puedo compartir esta entrada que os resultara bastante interesante y curiosa. Muchos nos preguntamos sobre las diferencias entre las distintas baterías del mercado y en la web que os mostraré a continuación nos ofrecen un extenso listado de baterías comparadas en distintas modalidades.

La web en si se llama lygte-info.dk y principalmente se dedica a hacer revisiones y noticias sobre linternas, cosa que nos viene bien ya que en de alguna manera ambos mundos se alimentan de la misma energía, las baterías 18xxx.

Como bien sabéis el “18” corresponde a los 18 mm de grosor de las baterías y los 3 números a continuación hacen referencia a su longitud: 350 mm, 500 mm o 650 mm.

En las siguientes gráficas podremos ver una extensa comparación de distintas baterías valoradas en: Longitud, diámetro, peso, capacidad de descarga por voltaje, capacidad de descarga por tiempo, energía, corriente y resistencia interna. Muchos datos para los vapeadores más exigentes.

Toda la información al completo la podréis leer en este enlace.

Before a battery can be used, it must fit in the equipment. With 18650 batteries there are some variations in size.

The 18650 specifications means that a cell is about 65 mm long, but protected batteries are longer, because a protection circuit must be added and sometimes there is also added a button top. Not all chargers and lights can take the longest cells.

There is a sligt variation of the diameter on 18xxx batteries, this is mostly due to the wire going from the plus pole down to the protection circuit and the extra wrapper layer. 16xxx and 17xxx will have smaller diameter and can often be used in lights designed for 2xCR123 batteries.

The weight is mostly interesting when there is suspection about the battery being a fake, they will often have another weight.

Capacity

Usual batteries are rated with capacity, i.e. how many mAh (or Ah) they have. This value is not a fixed value, but depends on the testing conditions. In these charts I do the test at different currents.
The capacity does also depend on what voltage is required, som equipment works fine at 2.8 volt, but other need more voltage.

The above chart show the capacity down to 2.8 volt, that is my lower test limit. This is a bit unfair to 2900 and 3100 mAh batteries, because they can work down to 2.5 volt.

Time

This is another way to look at the capacity, how long does it take to empty the battery at different currents.
These charts are with discharge down to 2.8 volt.

The first chart is in hours, this is fine to see the low currents, for higher currents the next chart is better.

In this chart the lower currents does not fit, but it is possible to see runtime at the higher currents.

Energy

Energy includes both current and voltage in the same measurement and is a better indication of what the battery can do.

Other measurements

Batteries has recommended maximum current drain on the cell. If this specification is missing, it can usual be assumed to be 2xC, i.e. a 2400mAh battery will have a maximum current of 4800mA or 4.8 Ampere. These assumed values are not shown in the chart.
Batteries with a PCB protection also has a trip current, this is at a higher value than the specified current. In my opinion 30% up to 50% above the specified current is best.
The “Protection trip” will be missing for unprotected batteries and because my test equipment is configured to starts at 3 ampere batteries with “Protection trip” below 3 ampere will also be missing.

Internal resistance shows how the battery handles a heavy load for short time (The actual test takes up to 1 minute). Batteries with a low resistance will hold the voltage better than batteries with a high resistance.