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same problem
We are also in this quandry.
Note that the battery listed on the spec sheet is ES-18-12 but the one in the kit is EX-18-12
FIRST posted a thread about this and said that the correct one is the EX-18-12 (check the FIRST SITE) and that it is specially made for FIRST and is "deeper cycling" We found ES-18-12 batteries locally (They are UPS batteries for computer systems...) but I cannot find any info on EX-18-12....
We are wondering whether we can use ES-18-12 batteries in competition...or any other battery for that matter...
Everyone seems to be assuming that they can use last year's batteries but the thread on FIRST was not clear on that point.
We are a ROOKIE team so we don't have any old batteries anyway but just want to do what's right
wish I could help further but I don't have any ideas yet
good luck
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