Rechargable batteries
 

Our DECT phone system is getting a bit old, but still works perfectly. But our daughter decided to buy a new one, BT7660.

I decided to read the instructions, and was puzzled to see this on one of the first pages:

"To keep the batteries in the best condition, leave the handset off the base for a few hours at a time.

Running the batteries right down at least once a week will help them last as long as possible."

Don't charge constantly like the one we already have (no battery changes in about 8 years)?

And running the batteries until flat before an 8-hour recharge, with the system down until at least some charge is in the batteries? And how would we manage to totally flatten the battery packs (2 x AAA)?

Has battery tech (NiMH) gone backwards?

Re: Rechargable batteries
 

Think thats the same for most rechargeable batteries. e.g. Laptops you're not advised to keep them plugged in all time and let the battery run down occasionally.

Re: Rechargable batteries
 

I thought only old Nicads suffered the memory effect

Re: Rechargable batteries
 

My OnePlus 9 Pro advises to charge to 80%, it has its own cut off and it also has night charge which lowers the charging rate so it doesn't over charge, sit on 100%. I of course have decided against the recommendations.

I had a home BT cordless phone. The batteries were cheap China clone quality, a nightmare.

Re: Rechargable batteries
 

That is correct, however, other types have other issues which can seem similar.

In fact, it appears that fully [deep] discharging rechargables can actually be bad for them.

Ref: https://en.wikipedia.org/wiki/Memory_effect