One of the more popular batteries is the Micro start from Anti-Gravity.
https://shop.antigravitybatteries.co...o-starts/xp-3/
I own the XP-3 and it's mostly been used to jump start friend's cars. It worked great! I have also used it to re-charge Cell Phones. A full charge lasts long time and several recharge for phones.
It would easily jump start ANY bike.
If you use to Jump start big trucks and cars, it may need to be charged up after a few.
It's a complete kit, comes with several adaptor cables for all sorts of devices.
I've never used mine until dead ... I did use it about half way discharged.
It took less than an hour plugged into power to recharge to 100%.
A nice feature is that if you leave it sitting around unused ... it does not discharge hardly at all if any. It stays at or near
100%. Very handy, worry free.
It's so small and light, it's super easy to take on bike trips. Perfect and it's always part of my travel gear. Anti-Gravity have several other batteries.
Check it all out, see what you think.
this one is pretty popular in UsA, although there are one or two other companies out there.