Thank you for your email. The problem with Bosch/Yamaha/Kalkhoff/Shimano/BMZ/Specialized batteries is the proprietary BMS (Battery Management System). If that has developed a fault then you essentially have a posh looking brick as these manufacturers will not make spares available, citing 'health & safety' reasons.
The BMS in these kinds of batteries is often booby-trapped to render itself permanently unusable under a set of pre-programmed, arbitrary conditions ie. Leaving the battery uncharged for x amount of time and/or detaching the BMS from the welded pack of cells.
These manufacturers simply want you to spend an exorbitant amount of money on a brand new battery.
I'm afraid that due to the above we do not work with such batteries, sorry.
With no disrespect intended and assuming you haven't invested too heavily in the bike and/or don't have any sentimental attachment to it, my advice to you would be to sell the bike and let someone else worry about the battery. I appreciate this may not be an option, in which case I'm afraid you will need to buy a new battery from the manufacturer at whatever price they're advertising at.
If however you are open to our suggestion, you can then purchase a conventional push bike (assuming you don't have one already), and convert it from scratch using good quality motors from the likes of Bafang, TQ, CYC, Tongsheng or Mac Motor (we can supply you with the latter as well as a top class battery that is far superior to your battery which uses at best average cells).
This way, in the event that anything goes wrong you are not tied into a proprietary system whereby you have to spend hundreds and hundreds of pounds on a replacement battery that in reality isn't worth more than £150-£200.00.
Kind regards,
Jimmy
The BMS in these kinds of batteries is often booby-trapped to render itself permanently unusable under a set of pre-programmed, arbitrary conditions ie. Leaving the battery uncharged for x amount of time and/or detaching the BMS from the welded pack of cells.
These manufacturers simply want you to spend an exorbitant amount of money on a brand new battery.
I'm afraid that due to the above we do not work with such batteries, sorry.
With no disrespect intended and assuming you haven't invested too heavily in the bike and/or don't have any sentimental attachment to it, my advice to you would be to sell the bike and let someone else worry about the battery. I appreciate this may not be an option, in which case I'm afraid you will need to buy a new battery from the manufacturer at whatever price they're advertising at.
If however you are open to our suggestion, you can then purchase a conventional push bike (assuming you don't have one already), and convert it from scratch using good quality motors from the likes of Bafang, TQ, CYC, Tongsheng or Mac Motor (we can supply you with the latter as well as a top class battery that is far superior to your battery which uses at best average cells).
This way, in the event that anything goes wrong you are not tied into a proprietary system whereby you have to spend hundreds and hundreds of pounds on a replacement battery that in reality isn't worth more than £150-£200.00.
Kind regards,
Jimmy
