From all this it follows that if you travel a lot, especially away from civilization, you will more than fit penlight batteries (more power, less cost) if you are a resident of the city and shoot a little, then the lithium-ion battery will be more convenient.
Lithium battery stocks Li-ion batteries have a low self discharge rate as well, that means the battery stays charged longer when you're not using it.I also have a Milwaukee Sawzall with Li-ion batteries. For some jobs I'll be using it all day, and put it to charge at night. But a lot of time I'm just using it for the odd cut here and there, and I just don't bother charging it. It never discharges itself, I don't think that saw battery has ever been flat, but I only ever charge it for the big jobs.
To add spice to your inclination for mini size gadgets, there are mini phone receivers in cool color having an operational range up to 10 meters with adjustable volume and built-in 300 mAH rechargeable Lithium battery giving a talk time of over 5.5. Hours. These mini phones are compatible with Nokia, iPhone, Blackberry, Samsung etc. The Bluetooth version V2.0 is compatible with V1.1/1.2 and comes with one USB charging cable, one carrying strap and a manual to consult. Now, you do not have to leave your desk to instruct, chat or gossip.
There may be stories of poor quality cheap cellphone batteries because let's face it, cheap does not really mean good quality. But there are cases when this is proven otherwise.
https://edisonlithium.com/ - Many of the battery products found at the dollar stores are made with carbon zinc, as opposed to lithium, so they do not last as long. Carbon zinc can also leak, thus doing damage to your electronics.
Lithium mines Ontario I almost passed this booth as I had my eye on a fancy robot down the aisle when an attractive woman asked me if I had ever heard of a DocuPen. She was waving what might be a high-tech wand at me that Harry Potter would be proud to possess. It looked like a somewhat oversized ball point pen.
The VR920 device simulates a 62" viewing screen but costs $399.95. The ultimate model costs $999.00. What a great way to enhance the mini screen on your handheld device. Clearly, this is a wining application that extends the limitations of Windows Mobile device small screens.
Li-ion Batteries last longer and charge quickly. A Li-ion battery and a quick charger make it possible to work all day with a cordless drill without stopping.