12V Tool With 10.8V Battery?

[Onoff]

My brother has a Sealey 12V polisher but it comes with a 10.8V Li-ion battery?

 

 

What's that all about then as in 10.8 / 12V?

 

I'm thinking to 3D print an adapter so he can use the Sealey battery on this old 12V Skilsaw I got given with a dead battery and no charger.

 

 

 

[ToughButterCup]

Here's the Bosch version of the same issue.

[Onoff]

16 minutes ago, AnonymousBosch said:

Here's the Bosch version of the same issue.

 

Thanks. 

 

So the 3 cell battery is 3x3.6V=10.8V but the peak voltage is 12V.

 

Much in the same way the 5 cell ones are 5x3.6V=18V but some drills quote the peak like Parkside, Ferrex etc.

[ToughButterCup]

Ya lost me with '... Much in the same way the 5 cell ones... '  

I'd 'a made a brilliant electrician.

[Jeremy Harris]

The reality is that the pack voltage is usually something rather different to the label voltage.  Just poked a meter on a Makita "18 V" BL1830 pack that hasn't been charged for several months.  It read 20.03 V.

[SteamyTea]

Is there a difference in measuring, one voltage with no load, another voltage when fully loaded.

 

Or just a rounding thing for marketing.

 

I am 5' 5 ¹/12^"

When you get close to a half, you round up, so I am 6'.

(also West Indian and very strong for special online marketing purposes)

Edited April 26, 2020 by SteamyTea

[Jeremy Harris]

8 minutes ago, SteamyTea said:

Is there a difference in measuring, one voltage with no load, another voltage when fully loaded.

 

Or just a rounding thing for marketing.

 

I am 5' 5 ¹/12^"

When you get close to a half, you round up, so I am 6'.

(also West Indian and very strong for special online marketing purposes)

 

I think it just relates to the different way manufacturers label the nominal voltage of lithium ion cells.  Most use either 3.6 V per cell or 3.7 V per cell, but a fully charged cell will usually be around 4.1 V to 4.2 V, and a discharged cell can be as low as about 3.2 V to 3.4 V.  In practice, most lithium cells seems to sit at around 3.8 V to 4 V per cell when reasonably well charged, so pack voltages are often higher than the nominal voltage on the label.