Ryobi 4V USB Lithium batteries are really convenient and easy to recharge and have a really easy way to see if they are fully charged.

In addition to the rechargeable batteries, Linogy’s Battery Charger is designed to handle both AA and AAA rechargeable batteries, including Lithium‑ion, NiMH, and NiCd types.

Avoiding lithium-ion battery fires PITTSBURGH (KDKA) - From car seats to laptops and to phones and E-bikes, reports of batteries catching fire has become almost commonplace.