Well we MUST change them every fortnight - we've all just had a Safety Warning about it.
Mine must be about due now, I'll have to mark it in my diary. When the Safety Warning arrived in my email, I'd recently changed it, but couldn't recall when exactly. No battery has EVER lasted less than about a month, Susan - think you need to tell Roche. You ARE using the batteries they send us - the Lithium ones , by choice whenever you possibly can?
They can't send just them in the post, so I always order a shedload when I order cannulas etc, then they come by courier so that's OK for them to do.
Recharge the handset every 2 nights overnight - little and often in the rule with those rechargeable batteries in them. Not anything like mobile phone or laptop ones!