The Medway Handyman wrote:

Lastly, I have an SIP 18v circular saw about 9 months old with 2 x 1.9 a/hr
batteries, but they don't seem to last any length of time at all - never
have done. Anything I can do with them?

How about getting it replaced under (presumably) the 12-month warranty
for (ahem) non-professional use?

David