The MP5k uses mini cells in a stick format, just like the AK47 with the folding stock, the other MP5 normally use the mini-cells in a rectangle format, or a Large battery.
Any retailer should be able to get that for you.
However, Graham, you should still do some research. That would help you choose or know about various options for more electrical power when the time comes.
Otherwise, if the gun is still as it came, you should not have any issue asking a Retailer to get you some. Just say it's for a Marui SD6.
If you want to use 'large' type batteries, you'll have to consider the full stock model or an external battery bag. Dont scrimp when you buy the battery charger.
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