Rechargeable batteries

[Zip106]

I need some Ni-MH batteries for my BT handset.

The ones in at the moment have lasted about 6 years but don't hold the charge very long now.
They have 550 mAh written on them (AAA) - what's the difference between those and 700 mAh?

Would the 700's be ok to use in a 'phone?

Ta.

[-Pete-]

Yes, they should last a bit longer between needing to be charged, that's all.

It's good for NiMh batteries to run them right down before recharging them, maybe not every time but let them go flat once every few months... but ONLY until the handset is starting to cut out, don't run them completely empty. Then give them a good continuous charge overnight so they're properly topped up.

EFSpelin

Edited by -Pete- on Wednesday 12th January 20:10

[mhill]

Head over to the 7dayshop.com just pick up the own brand ones they are fan dabby dozie

[Simpo Two]

Zip106 said:

Would the 700's be ok to use in a 'phone?

Yes if the physical size is the same.

But Li-ion batteries would be best if you can get them.

[Cupramax]

I went through the same palava recently, got mine from here, exactly the same as the originals...

http://www.batteriesplus.co.uk/acatalog/Batteries_...

[rhinochopig]

Be careful some units will only work with the same MAh cells. My mouse, for example, no longer charges from the cradle because I stuck some huge MAh cells in rather than the orginal spec.

[indi pearl]

I would not sugest you try L-ion batteries in any item that has NiMH batteries as standard. The charging system for NiMH batteries is completly different to that of L-ion and overcharging L-ion batteries is very far from good for your health!!

[-Pete-]

indi pearl said:

I would not sugest you try L-ion batteries in any item that has NiMH batteries as standard. The charging system for NiMH batteries is completly different to that of L-ion and overcharging L-ion batteries is very far from good for your health!!

Yes, stick with the same chemistry and voltage. The capacity (mAh) doesn't usually make too much difference, as most chargers are current limited. But Lithium Ion and Lithium Polymer batteries need to be charged very carefully, otherwise they explode.

This sounds like Beavis & Butthead http://www.youtube.com/watch?v=SQ0SNESIkWk

[VX Foxy]

-Pete- said:

indi pearl said:

I would not sugest you try L-ion batteries in any item that has NiMH batteries as standard. The charging system for NiMH batteries is completly different to that of L-ion and overcharging L-ion batteries is very far from good for your health!!

Yes, stick with the same chemistry and voltage. The capacity (mAh) doesn't usually make too much difference, as most chargers are current limited. But Lithium Ion and Lithium Polymer batteries need to be charged very carefully, otherwise they explode.

This sounds like Beavis & Butthead http://www.youtube.com/watch?v=SQ0SNESIkWk

Very important not to mix different capacities - so I would recommend only using matched cells in any device.

[-Pete-]

VX Foxy said:

-Pete- said:

indi pearl said:

I would not sugest you try L-ion batteries in any item that has NiMH batteries as standard. The charging system for NiMH batteries is completly different to that of L-ion and overcharging L-ion batteries is very far from good for your health!!

Yes, stick with the same chemistry and voltage. The capacity (mAh) doesn't usually make too much difference, as most chargers are current limited. But Lithium Ion and Lithium Polymer batteries need to be charged very carefully, otherwise they explode.

This sounds like Beavis & Butthead http://www.youtube.com/watch?v=SQ0SNESIkWk

Very important not to mix different capacities - so I would recommend only using matched cells in any device.

Agreed, all the cells should be the same capacity from the same manufacturer. My point was that 500mAh 700mAh etc won't make much difference, and the worst that can happen is that you kill one or more batteries. As opposed to throwing in some Li-Ion/Li-Po cells and using a 12V battery charger on them, where you might kill yourself/grandma/the cat etc.

[VX Foxy]

-Pete- said:

VX Foxy said:

Very important not to mix different capacities - so I would recommend only using matched cells in any device.

Agreed, all the cells should be the same capacity from the same manufacturer. My point was that 500mAh 700mAh etc won't make much difference, and the worst that can happen is that you kill one or more batteries. As opposed to throwing in some Li-Ion/Li-Po cells and using a 12V battery charger on them, where you might kill yourself/grandma/the cat etc.

Sorry, wasn't meant to be a criticism of your advice, just clarification

[hman]

nimh dont have to be run all the way down, its nicads which you used to have to do that to prevent the "memory" effect.

You cant buy nicads now anyway - (afaik)

Sticking a mah size thats up to 100% larger than original doesnt normally present any problems, however they will take longer to charge , but when they are fully charged they will last longer as they have a bigger capacity.

I once manager to pierce a lipo with a pin trying to get some ballast weight into a pico-z minature helicopter, smoke, and a lot of heat ensued- so much so that i launcehd it out of the front door onto the porch to burn itself out, theres a lot of energy even in the smallest lipos!

[Simpo Two]

Lipo?

Li-ion?

[rhinochopig]

Simpo Two said:

Lipo?

Li-ion?

Edited by rhinochopig on Friday 14th January 14:15