Can they be used while charging?

I have been doing just that for almost a year now using the FUVALI battery brand. BUT WITH WITH SOME CONCERNS! I have 4 individual Govee temperature transmitters charging every 12 hours for 5 minutes. Each USB charger is plugged into a KASA TP link smart plug set up with the built-in timer function. One of the FUVALI batteries started to heat up fueling my concern about fire risk. Therefore I started using the KASA switch. Since the battery is inside the temperature sensor I can monitor any spike in temperature. If the temperature increases with more than 1 degree F, I discard the battery. Normally I observe 0.5 F (which stays constant even when charging continously)

What is lithium polymer? I've heard of lithium ion but not lithium polymer

The main difference is that lithium ion uses a liquid electrolyte where a lithium polymer uses a dry solid electrolyte. My brother-in law- tried to explain the difference to me but it went over my head. I have the AA version and they charge up at just under 5v, but when removed from the charger they have lost 2 - 3 volts just sitting there. (All lithium batteries will lose some voltage maybe up to 2% per month.) Lithium polymer aren`t as popular as lithium ion. I`m new to this type also and I`m using two in a blink camera (Indoors) with no problems so far. One thing I like is the charge port in the battery. Service life will be shorter, but so far, I like them, only time will tell.

I see that it is recommended to use a 5 volt charger but it what amperage? Is it the same for each of Bump's battery sizes?

I do not know what the amperage is on the chargers I have but the Batteries recharge with the Kindle charger as well as the USB outlet on the newer power strips.

Do they have to charged before the first use?

Mine came with a "nominal" amount of charge in them. IMO to be sure you get the most life out of them, I would charge them. Its easy as plugging into a USB charger.

Antenna Location	TV Remote, Camera, Gaming Controller
Battery Weight	28 Grams
Unit Count	4.0 Count
Battery Cell Type	Lithium Ion
Reusability	Rechargeable
Voltage	1.5 Volts

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