Battery charge

[retiredNH]

Have a Trek Allant 8s purchased in March, a few hundred miles on it. Battery now charges only to 98%. Not terrible, but not ideal.

Is this normal? The LBS where I purchased is an hour away. I probably need to drag the bike in, but in the meantime, does anyone have a comment?

 

[William - Bosch Team]

Congrats on the new bike!

This is likely not an issue with your battery, but an issue with the way the software in your display is displaying battery charge level.

I believe you have the Smartphonehub on your Allant? Have you used your Cobi app to perform a software update on the SPH hub recently?

 

[retiredNH]

Congrats on the new bike!

This is likely not an issue with your battery, but an issue with the way the software in your display is displaying battery charge level.

I believe you have the Smartphonehub on your Allant? Have you used your Cobi app to perform a software update on the SPH hub recently?

No. Do I get an update reminder? If so, haven't seen one.

I'll go pair it and check....

 

[William - Bosch Team]

I'm not sure if Cobi sends a reminder, but I don't think it does. The software update may not solve it, but it's the first thing to check when experiencing minor issues such as battery % readout.

 

[retiredNH]

My app is up to date, and has been since the June release of the update. Today, when I unplugged the charger for a ride, it said 100% for a few seconds. When I put the phone in the cradle and connected it a few seconds later, the phone said 98%. Strange.

I'm making a visit to the seller in the next week - part of my monthly run to civilization, so I'll show them. It will be interesting to se what they say.

Thank you for looking into this!

 

[William - Bosch Team]

Very interesting. I'll ask the rest of my team if they've heard of anything like this.

I understand the want for everything to be right- that's how I feel when I buy something. The good news is that I think this is likely just a software-based cosmetic hiccup.

I'll get back to you once I've learned something new one this.

 

[amayers]

In my experience (Bosh Nyon on a R&M), the full charge % will fluctuate up to 3%. Generally I've noticed if I discharge the battery quite a bit (<20%) then the next charge will go to 100%. But if I just charge it when I'm over half full, I'll usually get to 98%. I've always chalked this up to Bosh's battery management/display. With lithium batteries, many (all?) battery management/charge systems won't charge the battery up to the exact same capacity every time. Often the management system will let it fluctuate a few percent, and adjust the displayed capacity so that the end user doesn't see it, and thus doesn't raise a question about it being "broken".

 

[webcurl]

When your battery has reached 100% charge or when it switches off charging indicating completion do you disconnect the charger immediately?
The Bosch battery BMS may be performing balancing at this stage (https://en.wikipedia.org/wiki/Battery_balancing), so perhaps occasionally leaving it plugged in longer may be beneficial.
Most Lithium packs have this and therefore 100% is not always 100% nor known accurately at any time. It should know 0% with a high degree of accuracy though.
Also the battery =may= need to go from completely flat or close to 0%, to 100% every now and then to determine exactly how much capacity is left in the battery (as this declines over age) so as to determine where 0 & 100% are.

 

[retiredNH]

I ride every other day or so. I just plug it in when I get home and unplug it when I start my next ride. I'm going to where I purchased it on Friday. I'll see what they say.

 

[Dallant]

The beauty of the Purion is that you are ignorant of what accurate percentage of charge you’ve actually attained.

 

[webcurl]

The beauty of the Purion is that you are ignorant of what accurate percentage of charge you’ve actually attained.

Same with the Intuvia - 1-5 bars