Charging problem how do I know when it is charged?

There is no battery charge state indicator. The owners manual merely states if the bike moves slow, charge the battery. There is a fuse that should be checked. See owners manual.

Owners Manual at the following URL
https://images-na.ssl-images-amazon.com/images/I/B1ZcFqeHgSS.pdf

A simple DMM can be used to check the battery charge state or an inexpensive $5 automotive battery checker from Harbor Freight.

https://www.harborfreight.com/12v-alternatorbattery-checker-59376.html?utm_source=google&utm_medium=cpc&utm_campaign=12144811130&campaignid=12144811130&utm_content=143358137956&adsetid=143358137956&product=59376&store=&gclid=CjwKCAjwivemBhBhEiwAJxNWN11ziTFc1SXqruBDHi_tR2ja_kgEEUAnKEIdrjspyV6LToV0Z0wziBoCJA0QAvD_BwE

The instructions (should) specify the charging time.
However, you can try operating the lights briefly during charging, then note the time taken until they work properly, then add an hour or so to allow full capacity charge.
As far as I know, solar arrays won't over-charge a battery, as it is more of a low-current trickle-charge, so you could leave it charging the whole day without damage.
The OEM may have a website with more info.

Sorry but you'll have to figure this yourself
Fixya has no control over your Visa card
Good Luck
How did you know you had this charge? Why don't you request info regarding the charge, when, where,etc and if it's not something you authorized ,just dispute the charge

Best to charge unit from Mains or Computer USB, then you know it's fully charged. Navman has charge in battery but you need to fully charge it yourself , then you know where you are.

Yes, you have to charge it before using it. Probably there will be a red light somewhere on the power bank while it is charging that should turn green or blue once it is completely charged.

You're best to charge them powered off. It's healthier for the batteries. Just put them on the charger and give them about 12 hours of uninterupted charging time.

That should not be too difficult to find out. Plug the phone in the charger and the charger to the wall socket. The phone should say Charging. Even if your particular phone does not say charging, leave the devices connected to the charger. After a few hours, unplug th phone and turn it on. If it does not stay on there is no charge. If it stays on, use your phone and see how long the charge lasts. If it lasts the same amount of time as it used to, then the charging occurs normally. If the charge does not hold, then there is incomplete charging or no charging at all.

when its fully charged, it goes off.

You can download it from JVC's site: http://support.jvc.com/consumer/product.jsp?modelId=MODL027544&pathId=12&page=1&archive=true

Don't know this particular model, but most cameras will charge battery only if they are switched off.

No way to know except you disconnect and watch your 4 baterry bars.

It take almost 4 hours to be full charge.