From Cambridge University Caving Club - CUCC wiki
(Add drill battery status page.) |
(Add drill battery status page.) |
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B6 50W charger (£11) would charge faster, but currently out of stock. Will buy if they return, otherwise B4 will have to do. | B6 50W charger (£11) would charge faster, but currently out of stock. Will buy if they return, otherwise B4 will have to do. | ||
| − | = Tasks = | + | == Tasks == |
| − | + | * Test drill batts from 2017. Done (3 need new cells) | |
| − | + | * Build 2 or 3 balancing autochargers. Cannot source female batt connector, so must buy dead makita chargers (about £10 each). Got one for £8 during training w/e. | |
| − | |||
| − | + | * Replace PCBs in 7 ('non-makita-charger') packs with own balance-connector board (about 3 hours per batt!): 2 done (April 15) | |
| − | + | * Rebuild 3 new packs. Needs proper tab-welder (Tried soldering last year, and DIY tab-welding - not reliable enough). Batt drilling current tested at 26A, so 15A cells needed. UK supplier is https://18650.uk/ Can now get 2 and 2.5Ah 15A cells, so should be able to build 4 or 5Ah capacity packs for ~£40. Nickel tab-strip bought. | |
| − | |||
| − | |||
| − | + | * Have bought/acquired parts for battery-tab spot welder (1kW transformer, controller, electrodes). Needs assembling. | |
| − | + | * New packs will need balance-connector board. | |
Last update 2018-04-17 | Last update 2018-04-17 | ||
Revision as of 01:58, 17 April 2018
More-idiot-proof drill-battery charging, and upgrading poorly drill packs
Wookey has built proof-of-concept idiot-proof 1hr charger out of makita charger case and B4 35W autocharger They are £9
B6 50W charger (£11) would charge faster, but currently out of stock. Will buy if they return, otherwise B4 will have to do.
Tasks
- Test drill batts from 2017. Done (3 need new cells)
- Build 2 or 3 balancing autochargers. Cannot source female batt connector, so must buy dead makita chargers (about £10 each). Got one for £8 during training w/e.
- Replace PCBs in 7 ('non-makita-charger') packs with own balance-connector board (about 3 hours per batt!): 2 done (April 15)
- Rebuild 3 new packs. Needs proper tab-welder (Tried soldering last year, and DIY tab-welding - not reliable enough). Batt drilling current tested at 26A, so 15A cells needed. UK supplier is https://18650.uk/ Can now get 2 and 2.5Ah 15A cells, so should be able to build 4 or 5Ah capacity packs for ~£40. Nickel tab-strip bought.
- Have bought/acquired parts for battery-tab spot welder (1kW transformer, controller, electrodes). Needs assembling.
- New packs will need balance-connector board.
Last update 2018-04-17