> 2.3.1 | Recommended Batteries

> When you choose a battery for your GSM application you can take advantage of one of the following two batteries offered by VARTA Microbattery GmbH. Both batteries meet all requirements listed above. They have been thoroughly tested by Siemens and proved to be suited for Siemens GSM modules.

> • | LIP 653450 TC, type Lithium Ion

> This battery is listed in the standard product range of VARTA. It is incorporated in a shrink sleeve and has been chosen for integration into the reference setup.

> • | PLF 503759C.PCM, type PoLiFlex® Lithium Polymer

> This battery has been especially designed by VARTA for use with electronic applications like mobile phones, PDAs, MP3 players, security and telematic devices. It has the same properties as the above Li-Ion battery, except that it is type Polymer, is smaller, lighter and comes without casing.
> Specifications, construction drawings and sales contacts for both VARTA batteries can be found in Section 7.1.