NiCd (nickel-cadmium) and NiMH (nickel-metal-hybrid) batteries are traditional alternatives when compared to lithium-ion batteries. NiCd batteries have higher capacity but are more prone to the "memory effect" and contain toxic cadmium. On the other hand, NiMH batteries are a more environmentally friendly alternative to NiCd, with higher capacity and no memory effect. Both types, however, are heavier than lithium-ion batteries.

Differences between Li-Pol x Li-Ion and NiCd/NiMh:

Li-Pol and Li-Ion batteries differ from NiCd/NiMH batteries primarily in their construction and properties. While Li-Pol and Li-Ion batteries are known for high performance and lower weight, NiCd/NiMH batteries have lower capacity and are heavier. Li-Pol batteries are more susceptible to damage when used incorrectly, requiring more careful maintenance. Li-Ion batteries, on the other hand, are slightly more robust but achieve higher energy density.

When choosing a battery, it is crucial to consider the specific needs and requirements of the airsoft weapon, such as power, wiring, protection (mosfet and processor units), or space for battery placement.

In terms of size and design, batteries can be divided into the following shapes:

• Monoblock (larger battery block for fixed stocks and machine gun magazines or handguards)
• PEQ (small battery block for AN/PEQ boxes)
• Stick (long narrow stick battery suitable for AK, CZ Scorpion Evo, CZ 805 BREN weapons)
• Buffer stick (long narrow battery in the -+ design for 130 x 20 x20 mm tube (buffer) of the stock)
• Mini stick (extra short stick battery for weapons with compact PDW stocks like ARP9 etc., or for VFC MP7 AEG weapons)
• Nunchuck (two-piece stick battery for CRANE/SOPMOD stocks, including EBB weapons like Marui NGRS, BOLT, etc.) and handguards
• Crane (three-piece stick battery suitable for CRANE/SOPMOD stocks with side storage space and part of the battery is in the tube)

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