mAh value? On replacement rechargeable battery..?

RainbowsInTheSpray

I have a Dyson V6 hand-held car vacuum and the battery seems to be going.

Looking for a replacement, I see that I can get fairly readily either a 9000mAh thing or a 6000mAh - either allegedly to suit this model - but not so readily a 1200mAh job which is actually the original one in situ and on the blink.

Does it matter if I put in a higher mAh value battery to replace this original? As far as I can make out, mAh is just a measure of what charge the battery can take. Maybe it would increase charging time..? Above all, I want to avoid any actual physical risk, obviously.

Very grateful for any advice.

Vitor

So long as the voltage is the same, these 3rd party batteries should be OK. TBH, I expect the mAh will be significantly overstated, most batteries from China are.

Newcad

The mAh is how much charge the battery will hold, so an indication of how long a full charge will last. (And of how long it will take to fully charge again).

As said always beware of false claims when buying online.

km1500

My advice would be not to leave a non- branded battery always plugged in charging in case it catches fire

forgotmyname

If the original is 1200mAh then a 6000mAh unit should be close to 5x bigger and heavier. Some variation will exist but
if it's considerably lighter then it's probably fake and not to be trusted.

A 9000mAh unit would be 7.5 times bigger/heavier.  They can be sneaky though and add metal os sand to add additional
weight.

PHK

forgotmyname said:

If the original is 1200mAh then a 6000mAh unit should be close to 5x bigger and heavier. Some variation will exist but
if it's considerably lighter then it's probably fake and not to be trusted.

A 9000mAh unit would be 7.5 times bigger/heavier.  They can be sneaky though and add metal os sand to add additional
weight.

The mAh rating isn't directly related to size and weight, rather also with chemistry and internal construction. 

Remember also, that the mAh rating is specified at a specific temperature and current drawn.

In very basic terms the higher the current drawn the lower the overall capacity. 

For example a battery quoted as 15,000 mAh at 50mA would have an apparent capacity of 10,000 mAh at 500mAh

So some of these third party batteries show an  apparent higher capacity by quoting it at a lower current draw. 

Beeblebr0x

km1500 said:

My advice would be not to leave a non- branded battery always plugged in charging in case it catches fire

By that logic, you'd be standing guard over it whenever it was charging. I'd avoid non-branded batteries altogether. What is the cost of safety?

jshm2

Most of the time the battery is fine, you just need to "jump" it, to get it charging again.

Obviously if it's looking like a "pillow" then you've got a small bomb on your hands and need haul it toot sweet. 

Otherwise get a conventional drill battery, charge it fully, and get a couple of small bits of copper wire. Connect negative to negative and positive to positive from the drill battery to the Dyson one. Hold for a couple of seconds, and then disconnect.

Your Dyson battery should be good to start charging again.

If not, then best take it into a battery refurbishment/repair shop and get them to do it.