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[TD]

These are for my landline cordless phones (3 in total)

As I discovered yesterday (don't use them much, as I usually use my mobile) the batteries are knackered. Only good for a quick phone call, more than 5 mins the phones turn off.

So, to replace them, which rechargeable battery type would be most suited to being on charge all the time, as I think the phone chargers never turn off (the battery compartment is always warm to the touch whenever I do pick them up)

Any ideas chaps 

[TheBoy]

Exactly the spec of the existing ones, as that's what the charger is designed around.

Most battery technologies used in that application are god for 300-500 charges, so being kept on full charge, probably about 2-3yrs.

My cordless is about 15yrs old, probably 2nd or 3rd set of batteries. I tend to not leave it on charge all the time, as the battery area does slowly heat up.  So I'll charge it overnight, then leave it off charge for 2 or 3 days until its only got about 1/3rd left, then repeat.

[TD]

Exactly the spec of the existing ones, as that's what the charger is designed around.

Most battery technologies used in that application are god for 300-500 charges, so being kept on full charge, probably about 2-3yrs.

My cordless is about 15yrs old, probably 2nd or 3rd set of batteries. I tend to not leave it on charge all the time, as the battery area does slowly heat up.  So I'll charge it overnight, then leave it off charge for 2 or 3 days until its only got about 1/3rd left, then repeat.

Ah....that's the problem...I changed them for some other rechargeable ones about a year ago, so no idea about original spec....

What sort of type (ie NiCad/etc) would best to use  What sort are in your phone ?

[TheBoy]

Mine are NiMH, but that's original spec. The charger is designed for NiMH.

Google phone model for spare batts, and see if you can get the spec that way

[TheBoy]

And when you get into the realms of Lithium, you have to be ultra careful, as then can be a bit volatile if mischarged.

[zirk]

I Always use Varta or GP Batteries for that kind of stuff and more. As TB says you need to find the original type and spec then get Varta/GP replacement. Far too much China crap around at the moment which can be any spec that have and relabled to sell.

[TD]

Mine are NiMH, but that's original spec. The charger is designed for NiMH.

Google phone model for spare batts, and see if you can get the spec that way

These seem to be the ones then.....thanks 

https://www.batteriesplus.co.uk/acatalog/BT-Synergy-3505-Series-Cordless-Phone-Rechargeable-Batteries.html?gclid=Cj0KCQjw_o7NBRDgARIsAKvAgt1bksaxYN3Hxlj0qzV7qNbZd5XPrhiFtwCCrVWwTEUeEtcBi1TyaEoaAmWYEALw_wcB

[JasonH]

If the originals were NiCAD then NiCAD would be best (they're better being on charge all the time). However these days NiCADs are rare because NiMH have so much more capacity.

So realistically you just want a pair of NiMH size AAA and the capacity doesn't matter too much. More and the phone will last longer once charged but you'll pay more for the batteries. I would imagine 550mAh would be loads for a cordless phone.

AAA NiMH are extremely common you'll find then in Tesco for example.

[STEMO]

I've had a twin set of BT phones for about 8 years, they just sit on the cradle and hardly get used. Never changed the batteries.

[TheBoy]

I've had a twin set of BT phones for about 8 years, they just sit on the cradle and hardly get used. Never changed the batteries.

You may find they can't manage a 30m call - but its luck of the draw, as the built in chargers are invariably crap, and you can bet the manufacturer gets the cheapest batteries it can get away with.


For pure abuse, NiCds are hard to beat