Thanks Tom - you are quite correct, and we can look at clarifying in the manual (see modified extract below).
Pat - sorry for the confusion caused - we wouldn't want anyone to throw away their Pico product just because of a battery problem.
The batteries inside the WPS500 (and the WPS600 for hydraulic testing), are designed to give a long service life.
For repair or replacement of the battery, simply contact Pico or your distributor to arrange a return - as you would for any repair.
Also please do contact your distributor or firstname.lastname@example.org
if you have any queries.Repairs
If the unit is damaged or stops working, or your battery is not charging or holding charge, return it to Pico Technology or an authorized Pico distributor for repair. Do not attempt to dismantle or repair the unit.Disposal
The WPS500X contains a lithium polymer (LiPo) battery that requires safe disposal.
If your battery has reached the end of its life, you may return the unit for repair.
When the transducer reaches the end of its life, take the entire unit to a battery recycling facility for safe disposal.