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I bought a DXG when Amazon re-released old stock after the PW3 was out. It had original battery, which was replaced recently, 10 years old date.
The life is related to manufacturing date AND total number of equivalent complete cycles, which ever comes first might be battery death and number of cycles possible and capacity reduces with age.
Higher temperatures age faster.
Life is better than Lead Acid Gel cell and some high capacity NiMH, but the NiMH capacity doesn't reduce as fast per cycle. Lithium weigh less, but the best NiMH are actually similar volumetric capacity and have advantage that they can last for years if stored flat.
Lead Acid must be stored over 50% charge, and is destroyed if stored flat, esp. Gel.
Lithium best stored 33% to 66% charge and can't be recharged if totally flat. It destroys them.
Only regular NiCd, NiMH and Lead Acid can be trickle charged when charged. Gel Lead Acid, high capacity NiMH and all Lithium types must disconnect the charging when charged, trickle charging a full cell damages the cell, or for Lithium, risks fire or explosion.
See Battery University site.
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