Whilst browsing another subject, i came across these interesting lithium packs for solar street light back up on Alibaba. !
https://www.alibaba.com/product-detail/ ... 39757b5Wf7
.. cheap apparent cost , $200 per kWh, ($300 for 12v 130ah) and multiple capacities available, they seem to have some unusual features, ...like remote internet condition monitoring and control via a wifi/app.
Not a lot of detail.. But 18650 based..and all on a common "tube" format. ?
I think it may even have a charge/discharge controller incorporated ?
Anybody seen or know anything about these ?