Touring 2cnd battery conundrum - 625 or 500

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FrothNinja

Veteran
I am looking to get a second Bosch battery to give me the ability to use the electric instead of the CX to tour on.
The stats first, the 625 is 700 gr heavier and £80 more.
What I am trying to ascertain is which is the sensible choice to take on multi-day bike packing.
I can pretty much guarantee I will get at least 70 miles out of the 625. What I don't know is how much less mileage the 500 will provide. I have heard that it is not a simple ratio (which would yield 56 miles) but I don't know if this true or not. Been told to expect something more like 20 miles left.
Has anyone been in the position to make this comparison?
Many thanks
 
Location
España
I am looking to get a second Bosch battery to give me the ability to use the electric instead of the CX to tour on.
The stats first, the 625 is 700 gr heavier and £80 more.
What I am trying to ascertain is which is the sensible choice to take on multi-day bike packing.
I can pretty much guarantee I will get at least 70 miles out of the 625. What I don't know is how much less mileage the 500 will provide. I have heard that it is not a simple ratio (which would yield 56 miles) but I don't know if this true or not. Been told to expect something more like 20 miles left.
Has anyone been in the position to make this comparison?
Many thanks

The word "touring" caught my eye and I know diddlysquat about batteries and e-bikes but.....

Sorry, it's not clear to me if you have one battery (625) and are considering buying a second (500) to take with you as backup or to replace the 625? I'm assuming you're considering a second, backup battery.

I'm sure you've thought of it but if going bike packing (which to my way of thinking suggests more off-road, emptier locations) remember that the going can be slower and therefore battery usage higher and places to recharge fewer and further between.
I'd keep in mind, too, the extra weight on the bike. Gear, food, water.
Batteries deteriorate over time. That may be a factor in your decision.
70 miles is a fair distance. I know we're all different but I don't have many touring days that long.

I'd also look at compatibility (do both batteries use the same charger?), things like charging times etc.
Then there's you and your "touring head". If the battery is dead is that going to send you into a tizzy or will you just shrug and apply some more legpower?

I suppose that someone suitably inclined could calculate the impact of carrying the lighter and heavier batteries on the battery powering the bike and establish the "real" benefit of one over the other. But that's very far away from my way of thinking ^_^

Finally, one of the most important factors for me to enjoy a day's adventuring on a bike is to minimise the worries and stresses. With a battery there will always be a hard limit. My instinctive reaction is to go for the larger capacity on the basis that I will worry less. Then again, another's instinctive reaction is to go for the lightest weight.
For anything that involves anxiety, I have always found that nothing beats personal experience for putting it to bed. You could load up the bike and set off for an hour or two without using the battery assist to feel what that is really like. Better still, after a long day, do the same. That might help you make up your mind.

Good luck!
 
My ebike has a Bosch Activ line system
300 WH battery

In summer I can generally reckon on 2 25 miles rides on flat (ish) ground - some bumpy some tarmac - and still have some charge left
If I forget to charge it I can do another ride but I will run out on the way back unless I run in "OFF" mode for the easier bits

so probably 60-65 miles - from a 300

clearly this is not loaded with weight in anyway - just a lock, basic repair stuff and a can and an apple
but I am not exactly Simon Yates (other Yates are available!) in my build and fitness - so the bike does have a fair bit of weight on it overall

In winter the range is quite a bit lower - which I put down to colder weather but wetter roads and tracks will also have an effect

Therefore I would expect quite a bit more than that from a 500 or 650 - unless it has a lot of charge cycles on it???
 
I think there is a Bosch site that gives you a range estimate based on different types of surface and bike and stuff

It was the most comprehensive I have seen - not sure how far it goes into bikepacking - but might be worth a look
 
OP
OP
FrothNinja

FrothNinja

Veteran
Useful stuff so far. Not found that Bosch list yet but I will keep looking.
Have to admit that I am leaning toward the bigger battery
 
Location
España
Given your other thread testing out your sleeping bag, I wonder is it also worth considering the impact of a cold night on your batteries? My understanding is that batteries can lose charge in cold weather? Where does your battery live now at night? Have you noticed any effects?
 
OP
OP
FrothNinja

FrothNinja

Veteran
Given your other thread testing out your sleeping bag, I wonder is it also worth considering the impact of a cold night on your batteries? My understanding is that batteries can lose charge in cold weather? Where does your battery live now at night? Have you noticed any effects?

Looks horrid but I wrap closed cell foam round the battery when riding in winter. As a rule the bike's battery doesn't get colder than 10 C when not being ridden.
 

CXRAndy

Guru
Location
Lincs
Given your other thread testing out your sleeping bag, I wonder is it also worth considering the impact of a cold night on your batteries? My understanding is that batteries can lose charge in cold weather? Where does your battery live now at night? Have you noticed any effects?

Sleep with the batteries 🤣
 
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