Supercapacitors compete with electrolytic capacitors and rechargeable batteries, especially lithium-ion batteries. A cordless drill is an electric drill which uses rechargeable batteries. The wireless controllers run on either AA batteries or a rechargeable battery pack. Most handheld rangefinders use standard or rechargeable batteries. Mobile phones generally obtain power from rechargeable batteries. Several flashlights are available with rechargeable battery packs. Many modern ones are powered using rechargeable batteries. This iPad uses an internal rechargeable lithium-ion polymer (LiPo) battery. The iPad uses an internal rechargeable lithium-ion polymer (LiPo) battery. They usually come with rechargeable batteries. Some chargers for rechargeable batteries indicate the ESR. Recently smaller cordless circular saws with rechargeable batteries have become popular. They are powered by mains electricity, with disposable or rechargeable battery backup. Today, flashlights use mostly light-emitting diodes and run on disposable or rechargeable batteries. Supercapacitors bridge the gap between conventional capacitors and rechargeable batteries.