Hi,
I'm about to buy a new battery pack for my Bosch ebike. My ebike is 36V with a 350W nominal motor. However afaik the motor can draw up to 540W peak. Not sure whether this is exact but I guess that max amperage should always be <18A anyway.
I'm considering two different packs:
- 10S4P made with Samsung 29E cells (400Wh) (original Bosch)
- 10S5P made with Samsung 26H cells (468Wh) (compatible aftermarket replacement)
Obviously cell capacities are different but the number of parallel cells compensate for that, so that the pack with 26H cells has a slightly larger capacity compared to the one with 29E cells.
Both packs come at about the same price (10$ difference) so price is not a factor. I'm mostly interested in cycle life, reliability and range. The 29E cell has a max discharge of 8.25A so in a 4P pack, that's 33A. The 26H has a max discharge rate of only 5.2A but in a 5P pack that's 26A. So both pack would be sufficient for my needs but the 29E pack appears superior in term of max discharge rate. On the other hand, if we consider my actual needs (say 18A discharge), the 29E cells in the 4P pack would be discharged at 1.55C while the 26H cells in the 5P pack would be discharged at 1.38C. So in theory, the load is slightly smaller for the 26H pack (which could translate in longer cycle life??) although the difference is small.
Which of these 2 packs would you recommend and why? Are these minor differences in discharge capacities meaningful at all in real life? The second pack (468Wh) has more capacity but I wouldn't favor that if this comes with a lower cycle life. My current pack is the 400Wh (original Bosch) and it is almost 8 years old and still working fine (although its power lags a bit obviously). Thanks for your suggestions!
I'm about to buy a new battery pack for my Bosch ebike. My ebike is 36V with a 350W nominal motor. However afaik the motor can draw up to 540W peak. Not sure whether this is exact but I guess that max amperage should always be <18A anyway.
I'm considering two different packs:
- 10S4P made with Samsung 29E cells (400Wh) (original Bosch)
- 10S5P made with Samsung 26H cells (468Wh) (compatible aftermarket replacement)
Obviously cell capacities are different but the number of parallel cells compensate for that, so that the pack with 26H cells has a slightly larger capacity compared to the one with 29E cells.
Both packs come at about the same price (10$ difference) so price is not a factor. I'm mostly interested in cycle life, reliability and range. The 29E cell has a max discharge of 8.25A so in a 4P pack, that's 33A. The 26H has a max discharge rate of only 5.2A but in a 5P pack that's 26A. So both pack would be sufficient for my needs but the 29E pack appears superior in term of max discharge rate. On the other hand, if we consider my actual needs (say 18A discharge), the 29E cells in the 4P pack would be discharged at 1.55C while the 26H cells in the 5P pack would be discharged at 1.38C. So in theory, the load is slightly smaller for the 26H pack (which could translate in longer cycle life??) although the difference is small.
Which of these 2 packs would you recommend and why? Are these minor differences in discharge capacities meaningful at all in real life? The second pack (468Wh) has more capacity but I wouldn't favor that if this comes with a lower cycle life. My current pack is the 400Wh (original Bosch) and it is almost 8 years old and still working fine (although its power lags a bit obviously). Thanks for your suggestions!