I have not had a lithium pop, a bunch have leaked.
Truth be told, if your lights are efficient, and considering that lithium stays charged in storage, you'll be unlikely to need charging in the car.
I do find 3 mode acceptable.
Hi/Low/strobe, not that strobe is useful, but HI is often TOO bright and 1-2 hour run while low can provide 10 hour run.
I like Ebay a lot, specifically sellers in Chino Cali.
There are also ebay sellers with zero feedback, crazy low prices, and they will likely be banned shortly when their competition reports the low BIN as fraudulent.
Yet I never had a problem getting a refund on defective items (expect a higher defect rate on these, just order multiples and you'll come out ahead)
If you just want to get a taste.... or hooked LOL.... here is light + batt + charger for $4.89 DELIVERED from USA.
Here is a beast, supposedly 3 mode, should outshine any light you've ever seen, I haven't bought from this seller.
I'm going to buy 6 of these RIGHT NOW BEFORE HE GETS BANNED!!!!!!!!!!!!! (edit, bought 11)
previous listings I found, downgraded because of the beast.
Here is one of those new sellers. Hard to go wrong for $2.79, I'm going to order 1 now!
Same seller, stock images and no idea what LED is in this. $3.25 Going to order one of these too (the body is a standard item called C8, much like the UF 501)