How long do the lithium batteries last? Batteries are not usually included in the warranty, or only for a few months. Are the XP lithium batteries guaranteed? What is the procedure for replacing them and how much do they cost?

[FORUM XP]

[b]Battery durability:[/b]
The LiPo batteries are designed to bear hundreds of charges and to last several years in your detector, thus resulting in significant savings in terms of purchase of batteries.
After 400 charging cycles the battery still has 80% of its capacity, which then gradually begins to decrease over subsequent cycles.
As an indication, the batteries should last for around 3 to 5 years when used on a weekly basis.
Attention: long-term storage of discharged batteries may reduce their overall durability.
So do not store your device for long periods with discharged batteries! If the detector has to be placed in storage, first charge the batteries to half of their capacity (40 to 70%), which corresponds to approximately two bars on the charging icon.
Ideally you should then discharge/recharge them at least once a month.

The three DEUS batteries are identical.
The batteries for the wireless headphones and the remote control are easy to replace as they are connected to the circuit with a mini-connector and double-sided adhesive tape.
The search coil battery is sealed for obvious reasons of safety and impermeability.
It must be returned to our service department or to your local XP distributor for replacement.

At the present time,the cost of replacing the coil battery (once the guarantee has expired) is 45 Euros including tax, and the battery for the headphones or remote control is 38 euros including tax (parts and labour).
If you replace all three batteries (headphones, coil and remote control) at the same time, the cost is 95 euros including tax.
[b]The batteries, like the rest of the detector, have a two-year guarantee for parts and labour![/b]