Festool Owners Group

FESTOOL DISCUSSIONS => Ask Festool => Topic started by: BonnieK on January 23, 2022, 10:33 PM

Title: C12
Post by: BonnieK on January 23, 2022, 10:33 PM
Got a used C 12 drill.  Im not sure if the batteries are shot or if there is something wrong with the trigger... When I pull on the trigger is goes but then shuts off.  Is this part of the safety feature or maybe the batteries are bad?  Iʻll invest in new batteries if thats the problem.  It has a nice angle attachment. 

Or is their value in the attachments for the classified section?
Title: Re: C12
Post by: SRSemenza on January 24, 2022, 12:08 AM
I'd start by testing the battery. If you have access to a multimeter there are plenty of YT videos that show how to test the battery and charger.

   Seth
Title: Re: C12
Post by: mino on January 24, 2022, 08:01 AM
The C12 Li has a battery capacity indicator so I presume you have the NiCd/NiMH model.

If you have the older model, it may be better to get a new T18 and use the angle accessories and the Centrotect chucks you got with it. One never has enough Centrotec chucks once gets hang of it. :D

The chucks are worth still the same (i.e. a lot) even old while a NiCd/NiMH drill/charger itself is probably not worth investing into.

Else, as, mentioned, check the battery .. the C series drills had electronics to prevent over-discharging the battery even in the oldest models.
Title: Re: C12
Post by: waho6o9 on January 24, 2022, 09:18 AM
The C12 drills are awesome.  After testing your batteries I'd source some aftermarket batteries if they're needed. 

PM sent. 
Title: Re: C12
Post by: SRSemenza on January 24, 2022, 11:14 AM
The C12 Li has a battery capacity indicator so I presume you have the NiCd/NiMH model.

If you have the older model, it may be better to get a new T18 and use the angle accessories and the Centrotect chucks you got with it. One never has enough Centrotec chucks once gets hang of it. :D

The chucks are worth still the same (i.e. a lot) even old while a NiCd/NiMH drill/charger itself is probably not worth investing into.

Else, as, mentioned, check the battery .. the C series drills had electronics to prevent over-discharging the battery even in the oldest models.

The C12 LiOn batteries that I have, do not have battery charge indicators on them. The indicator is on the drill.

Seth
Title: Re: C12
Post by: mino on January 25, 2022, 06:00 AM
The C12 LiOn batteries that I have, do not have battery charge indicators on them. The indicator is on the drill.

Seth
Yes, that is what I meant.

Presume the OP does not have the C12 Li but the original C12 without the charge indicator.

Batteries for the original C12 NiCd/NiMH version are still to be found (BPS 12), but IMO not worth it.
Title: Re: C12
Post by: Paul_HKI on January 25, 2022, 08:56 AM
The C12 LiOn batteries that I have, do not have battery charge indicators on them. The indicator is on the drill.

Seth
Yes, that is what I meant.

Presume the OP does not have the C12 Li but the original C12 without the charge indicator.

Batteries for the original C12 NiCd/NiMH version are still to be found (BPS 12), but IMO not worth it.


I’d recently bought VHBW branded aftermarket NiMh ones for a pair of old C12’s which prove to be good value for money.  €50 for a pair including delivery from Germany on the usual online auction site.
Title: Re: C12
Post by: PaulMarcel on January 25, 2022, 07:06 PM
I have the original C12 with NiCd/NiMH batteries. The Festool batteries don't really work anymore, but for $30 I got a larger-capacity battery off Amazon. If you already have that nice drill, $30 is nothing. Batteries Plus near me also said they could take the Festool battery apart to replace the cells. Not sure the charge on that, but he guessed ~$60 (this was 2017)
Title: Re: C12
Post by: greg mann on January 25, 2022, 07:51 PM
I have the original C12 with NiCd/NiMH batteries. The Festool batteries don't really work anymore, but for $30 I got a larger-capacity battery off Amazon. If you already have that nice drill, $30 is nothing. Batteries Plus near me also said they could take the Festool battery apart to replace the cells. Not sure the charge on that, but he guessed ~$60 (this was 2017)

Agree, as I have this vintage c12 and have had several batteries rebuilt. I actually have the 12
volt predecessor TDK as well, that I keep at the ready in the basement to save steps. So, 4 NiCads and one NiMh battery. The NiCads had been rebuilt by BPlus and are still going strong after 5 years or more. A reasonable cost to maintain the utility of a very nice tool. FWIW, the tech said the Festool battery was the easiest rebuild he had ever done.