Removing and repacking Focus Jam/Sam2 battery

Danijel

Active member
Aug 13, 2018
54
28
Netherlands
Ride
Turbo Levo
Hey Guys,

I was wondering if any of you have ever removed the internal battery of a Focus Jam2?

I would be interested i knowing if would be possible to repack the battery in the future.

Greetings,

Danijel
 
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Danijel

Active member
Aug 13, 2018
54
28
Netherlands
Ride
Turbo Levo
Yeah i figured that out. I even removed the motor (which is surprisingly easy). But when is saw the battery including all the wires in there i decided to not remove it.

Repacking a battery means replacing all the cells in the pack with new ones. This could save a lot of money because you won't need to buy a completely new pack from the manufacturer.

At a cost of around 4 euro per cell i could rebuild the pack for around 140 euro with LG 3600 mah cells. Focus wont probably sell me a new pack for that price. I do wonder what the price for a replacement pack would cost. Can't find that information anywhere.
 
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Injidup

Active member
Oct 2, 2018
87
28
Perth, Western Australia
Ride
Focus Bold2
Yes, very difficult to find that sort of information. I can’t even find a price for a replacement charger. I was considering keeping one at work for when I commute, but I don’t need it as I have plenty of battery left.
Apparently you should get over 1000 charges before the battery starts to lose power. I’m charging 2 to 3 times a week, so that equals around 300-500 weeks!
 
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bissona

E*POWAH Master
Patreon
Oct 14, 2018
136
158
Guernsey
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Focus JAM2
Removing the battery is a 2-3 min job once you have the engine off, but it can be a bugger to get back in due to the wiring loom. The battery does have a really annoying habit of catching the frame on the way out, requires a fair amount of jiggling sometimes.

We had a dead battery recently (child/sea water incident....) and the cost of replacement from Focus was around €450, so take care of them!

We also tried to break open the old battery (an electrical engineer did, at least) but it was so well caulked together than it didn't want to budge. We didn't want to destroy the case, so left as it as it was and just replaced it.
 

OldBean

E*POWAH Elite World Champion
Patreon
Apr 28, 2018
353
373
East anglia
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Focus Jam 2
I love my Focus Jam but this overall problem rather bugs me. Battery accessibility is my only worry especially when away from home and needing a charge.
My next EMTB will have easily removable battery...never mind the weight...:eek: ~And a gearbox:LOL:
Meantime I intend to HAVE FUN.
 
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bissona

E*POWAH Master
Patreon
Oct 14, 2018
136
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Battery accessibility is my only worry especially when away from home and needing a charge. My next EMTB will have easily removable battery...never mind the weight...:eek:
We bought the T.E.C. packs and they work great for this scenario. Will be taking them to Spain in April to see how far they take us in a full day in the mountains. :)
 

Danijel

Active member
Aug 13, 2018
54
28
Netherlands
Ride
Turbo Levo
Removing the battery is a 2-3 min job once you have the engine off, but it can be a bugger to get back in due to the wiring loom. The battery does have a really annoying habit of catching the frame on the way out, requires a fair amount of jiggling sometimes.

We had a dead battery recently (child/sea water incident....) and the cost of replacement from Focus was around €450, so take care of them!

We also tried to break open the old battery (an electrical engineer did, at least) but it was so well caulked together than it didn't want to budge. We didn't want to destroy the case, so left as it as it was and just replaced it.
Thank you for this information. This everything i needed to know.

And 450 seems reasonable. Specialized asks around 850 for the Turbo Levo
 

S D

Active member
Subscriber
Mar 26, 2019
129
38
Shelley
Ride
Focus Jam2 9.6
Would anyone happen to have any pics of the motor removal procedure?
Even some of how to remove the cover to check for muck ingress etc would be useful.
 

simtee

Newbie
Oct 5, 2019
11
3
Finland
Ride
Focus Jam2 9.6
Would anyone happen to have any pics of the motor removal procedure?
Even some of how to remove the cover to check for muck ingress etc would be useful.
I too would like to have some detailed info about battery removal. My Jam2 9.6 carbon frame is making annoying creaking noise during driving which disappears when I loosen those 2 big battery screws a bit. I would like to take battery out check what needs to be oiled etc. to get rid of the noise...
 

MartinW148

Well-known member
May 30, 2018
153
78
Essex, England
Removing the battery is a 2-3 min job once you have the engine off, but it can be a bugger to get back in due to the wiring loom. The battery does have a really annoying habit of catching the frame on the way out, requires a fair amount of jiggling sometimes.

We had a dead battery recently (child/sea water incident....) and the cost of replacement from Focus was around €450, so take care of them!

We also tried to break open the old battery (an electrical engineer did, at least) but it was so well caulked together than it didn't want to budge. We didn't want to destroy the case, so left as it as it was and just replaced it.
Do you know what size cells are in the battery?

Thinking if you can rebuild with bigger cells for more capacity (same size cells).
 

steve_sordy

E*POWAH Elite World Champion
Nov 5, 2018
2,723
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Grantham, UK
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Focus Jam2 9.6 NINE
We bought the T.E.C. packs and they work great for this scenario. Will be taking them to Spain in April to see how far they take us in a full day in the mountains. :)
I hope that you are driving there. Batteries of this size are not allowed on the aeroplanes.
 

steve_sordy

E*POWAH Elite World Champion
Nov 5, 2018
2,723
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Grantham, UK
Ride
Focus Jam2 9.6 NINE
Be aware!
JE James replaced the battery on my Jam2 at the request of Focus. A month later, I got intermittent problems with the display not coming on and no power. Turned out to be that one of the electrical cables had been pinched during battery installation, damaging the wiring.
 

bissona

E*POWAH Master
Patreon
Oct 14, 2018
136
158
Guernsey
Ride
Focus JAM2
I hope that you are driving there. Batteries of this size are not allowed on the aeroplanes.
Yes, we drove! Have been down to southern France / north Spain three times with the bikes now, some great riding and cracking places to stay.
 

bissona

E*POWAH Master
Patreon
Oct 14, 2018
136
158
Guernsey
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Focus JAM2
I too would like to have some detailed info about battery removal. My Jam2 9.6 carbon frame is making annoying creaking noise during driving which disappears when I loosen those 2 big battery screws a bit. I would like to take battery out check what needs to be oiled etc. to get rid of the noise...
It’s very easy getting the battery out (20 mins careful work) but, as @steve_sordy points out, you do need to be careful with how the cables go back. The cables seem very long, and sometimes don’t want to stay in the right place when refitting the battery. A bike stand with a rotating head can help.
 

MartinW148

Well-known member
May 30, 2018
153
78
Essex, England
Pretty sure they’re 18650s, and they look pretty tightly packed in there.
A quick bit of Google and I can see you can get these anywhere from 2500mah to 3500 mah, with varying Amp ratings 10a to 30a. Still no idea what the standard ones are (and I am no expert) but I guess it must be technically possible to upgrade with denser cells?
 

bissona

E*POWAH Master
Patreon
Oct 14, 2018
136
158
Guernsey
Ride
Focus JAM2
A quick bit of Google and I can see you can get these anywhere from 2500mah to 3500 mah, with varying Amp ratings 10a to 30a. Still no idea what the standard ones are (and I am no expert) but I guess it must be technically possible to upgrade with denser cells?
I would probably want to speak to the designing engineer at Focus before swapping anything. I can imagine that higher rated cells have less room for expansion, and/or are designed for low loads than our bikes have. Ambient operating temperature ranges from 0C to 35C, for me at least, which would cause some concern if the wrong cells were used.

Personally, I am more interested in repacking once the cells start to die, so would like to ask the engineers what cells they would have used if price had not been an issue. These bikes will be 100% useless in the future without a viable power source, and my experience with 3rd party laptop batteries gives me the impression that this is a job best done ourselves!
 
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