Flat battery

[thomas oliver 2Participant @thomasoliver2]

My recent experience and testing shows that lithium ion cells are much superior to either nicad or nimh cells. They hold their charge extremely well and have excellent output. I recently fiited 2×3.7v cells in parallel to my B&D screwdriver by removing two internal ribs, and the result is most satisfactory. I then fitted another two into a small electric hand drill similarly. I obtained these cells as one pack from a sales basket in a Halfords shop for £3. They were from one of those portable DVD players. I did not charge them and did not use them for nearly six months and when I tested the pack by a quick short out of the leads, they nearly welded together. These cells are nominally 3.7 volts, but are slightly bigger than AA cells, but I see that some Hongkong firms are offering what appear to be sub C sizes. I recently bought a collet chuck and ten ER16 collets from one firm there for about £40 including postage – about one third of the price charged in this country. They arrived in five days and are excellent. So some of these firms can be trusted. Their paper work and communications were in impeccable English. I have been using all types of cells for RC flying since the first Deac cells were introduced, when these were either 250mah or 500mah. These Lithium cells are now being offered with 5000mah capacity- quite amazing. Lithium Polymer is a different kettle of fish. Too much charge and they are junk. Let them run down too far and they are junk. Unless charged and handled with extreme care they can be mini fire bombs.

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